- Patrick Star
- SpongeBob SquarePants
- Goofy Goober (mentioned)
- Squidward Tentacles (Heard Only)
- Sandy Cheeks
- Peanut (debut)
- Fully Automated Nutcracker (debut)
- Alternate-Universe SpongeBob
- Manta Ray (debut)
- Dr. Marmalade (debut)
- Lord Reginald (debut)
- Professor Percy (debut)
- Bus Driver
SynopsisThe Chimpanzee beneficiaries of Sandy’s undersea treedome are paying a visit to see what progress she has made with her inventions. But Sandy doesn't think any of her work will satisfy the chimps, and if they don’t like what she’s invented Sandy could lose her funding, forcing her to leave Bikini Bottom. SpongeBob and Patrick decide to help their distraught friend by taking over her work and finishing her inventions for her.
At first, Patrick has ideas of things that have already been invented, such as a pencil and a mirror (which ironically is actually a parallel universe). After hours of hard work, SpongeBob and Patrick invent a back scratching, hair-combing, nose-picking ukulele-tuner. When the Chimps arrive, Lord Reginald is the first to test it (though never wanted to, as Patrick forced him). Shockingly, the invention works, but when tuning the ukulele, the machine malfunctions, hits Reginald with the ukulele, slaps him, then starts attacking him with all sorts of weapons.
Meanwhile, Sandy hears the screaming of Reginald, and arrives just as the machine spits out Reginald. The chimps decide to close down the Treedome, but when Dr. Marmalade holds out a banana, Sandy's "nutcracker" peels it for him. It is revealed that this is an invention that Chimps have been searching hundreds of years for. Soon they decide to let Sandy stay for 20 more years, including a higher salary.
After the chimps leave, Patrick decides to test out the machine that injured Reginald, which, of course, malfunctions on him, yet he still yells out "All right!"
|( ‣ ) Associated production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
‣ The Drunken Sailor - Nicolas Carr [title card]
‣ Intro Fanfare - Raymond C. Jones [Goofy Goober backscratcher]
‣ Unknown Track 42 - choir
‣ Sweet Perfume - Joe Sherman [SpongeBob scratching his back]
‣ Steel Sting - Jeremy Wakefield ["Oh, sorry."]
‣ Steel Licks (a) - Jeremy Wakefield ["To Squidward's house!"]
‣ Steel Licks - Jeremy Wakefield ["To Sandy's house!"]
‣ Lurching Monster [#4] - Harry Bluestone, Emil Cadkin [broken inventions]
‣ Hawaiian Cocktail - Richard Myhill ["None of my inventions are any good."]
‣ Troop Movement - Sam Fonteyn [SpongeBob talking to a peanut]
‣ Taps - peanut ground up
‣ Busy Life - Cedric King-Palmer [Sandy's nutcracker]
‣ Domestic Fun (b) - Ernest Tomlinson ["I can't even make a simple nutcracker."]
‣ Sweet Perfume - Joe Sherman [Patrick scratching his back]
‣ O Makalapua (b) - Kapono Beamer ["Oh, it's no use, SpongeBob."]
‣ Marlin March - Sage Guyton, Jeremy Wakefield [Patrick's "inventions"]
◦ So Long, Bikini Bottom - Luke Brookshier, Peter Straus
‣ Power Plant - Cecil Milner [SpongeBob and Patrick working on an invention]
‣ Goofy Conversation - Nicolas Carr, Barry Anthony [Sandy's bosses arrive]
‣ Proud Fanfare - David Farnon [SpongeBob and Patrick's invention revealed]
‣ Vibe Sting - Nicolas Carr ["This is where our research money went?"]
‣ Earl's Revenge - Sage Guyton, Jeremy Wakefield ["Step right up!"]
‣ Unknown Track 40 - Nicolas Carr [machine malfunctions]
‣ Solo Steel - Jeremy Wakefield [bus pulls up]
‣ Dramatic Impact 5 - Ivor Slaney ["What in tarnation?"]
‣ Dramatic Cue (d) - Ronald Hanmer [Sandy gasps]
‣ Steel Licks (b) - Jeremy Wakefield ["Lord Reginald, are you all right?"]
‣ South Pacific Island II - Victor Cavini ["I'm sorry, Sandy."]
‣ Busy Life - Cedric King-Palmer [nutcracker peels bananas]
‣ Hall of Fame [#4] - Harry Bluestone ["It's the banana peeler we've been searching 117 years for!"]
‣ Hall of Fame [#9] - Harry Bluestone ["It's the banana peeler we've been searching 117 years for!"]
‣ Earl's Revenge - Sage Guyton, Jeremy Wakefield [ending]
- This episode is available on Whale of a Birthday, Season 4 Volume 2, First 100 Episodes, and Complete Fourth Season DVDs.
- As of August 11, 2016, The Internet Movie Database (IMDB) gives this episode a rating of 7.9/10 based on 179 ratings by users. TV.com users give this episode a 7.7/10 based on 129 votes.
- The back scratcher that SpongeBob buys at the beginning of the episode costs him 52 box tops.
- This is the first episode to have actual land mammals in it besides Sandy, Mermaid Man, and Barnacle Boy.
- The first episode to reference the Goofy Goober Ice Cream Shop, outside the first movie. The second will be "Born to Be Wild," the third will be "Porous Pockets," the fourth will be "Chum Bucket Supreme," the fifth will be "The Clash of Triton," and the sixth will be "Lost and Found."
- Sandy will be able to remain in Bikini Bottom for 20 more years, before her next expiration on October 23, 2026. However, in the movie which is set in the year 2030, she is still in Bikini Bottom. One possible explanation is that she was visiting or she got a renew for her contract.
- Based on the comparative size of SpongeBob and Patrick when compared to the humans depicted in The SpongeBob SquarePants Movie, the chimps depicted in this episode would only be 2-3 inches tall.
- The chimps have been searching for the banana-peeling nutcracker since 1889.
- After Sandy's song ends, SpongeBob and Patrick start crying just like in "Texas."
- The things holding SpongeBob's invention together:
- Screws driven into bottle caps
- Pieces of tape made into an X
- A taped down lollipop
- Chewed bubble gum
- The towns for those that have nowhere else to go, as mentioned by the bus driver, in which the bus makes stops to:
- SpongeBob's invention is called "The Automatic Back-Scratcher, Hair-Comber, Nose-Picker and Ukulele-Tuner 9000."
- The peanut SpongeBob talks to says, "It's dark in here."
- The inventions Patrick thinks of:
- Pencil: (A stick that can be used to draw or write stuff with)
- Light bulb: (A glass ball that lights up so the user can see in the dark)
- Mirror: (A parallel universe)
- In this episode, SpongeBob and Patrick's water helmets are worn with the openings facing up, like they wore them in the episode "Tea at the Treedome." This happens again in the episodes, "Squidtastic Voyage" and "What Ever Happened to SpongeBob?"
- The list of items shown when "The Automatic Back-Scratcher, Hair-Comber, Nose-Picker, and Ukulele-Tuner 9000" goes haywire include:
- An electric saw with a circular blade
- A flamethrower
- A pair of scissors
- A corkscrew
- An aerial poison dart
- A taser
- Inventions the chimps have been searching for many years:
- Banana peeler
- Poop thrower
- The chimps exclaimed they searched 117 years for a banana peeler, so they should be older than that, making them the oldest mammals in the show.
- This episode first aired in Canada on October 23, 2006.
- When Sandy sings her "birds that fly upon the ground" line, a manta ray swims by, releasing a bird call. This is strange because most birds are depicted as scallops.
- Patrick often insultingly refers to SpongeBob as an "unpaid intern" in this episode. Strangely, he is perfectly fine with actually being an unpaid intern (and referred to as so) in "Bummer Vacation."
- When SpongeBob talked to Patrick about his mouth moved before the reflection.
- In Sandy's song, you can hear string squeaks camouflaged in the background of her music. Although in "Texas," you can hear that the guitar strumming sounds distorted, so the string squeaks can't be heard.
- Running Gag: Patrick wants people to call him "Mr. Dr. Prof. Patrick."
- SpongeBob's reflection has a Ukrainian accent.
- In Greek, this episode is called "Έρχονται οι πίθηκοι" which means "The ape's are coming."
- This episode premiered on John Rhys-Davies' 61st birthday and five years after "Life of Crime" and "Prehibernation Week" premiered.
- In Croatian dub, the episode name is "Majmunska Posla", translating to "Monkey Tricks."
- This episode title is a parody of Chips Ahoy!, a popular cookie snack.
- Christopher Ryan, Rik Mayall and Nigel Planer are best known for their roles as Mike, Rick and Neil on the  TV series called The Young Ones.
- The helmet Sandy invented is similar in style and design to the helmet worn by Noodle, fictional guitarist for Gorillaz, an American rock band, during Phase 1.
- The Automatic Back Scratcher, Hair Comber, Nose Picker, and Ukulele Tuner 9000 resembles the Cortex Vortex from the Crash Bandicoot series.
- Lord Reginald appears to be a parody and resemblance of Cranky Kong from the Donkey Kong Country series.
- The chimps arrive in a yellow submarine. This is a possible reference to the 1966 Beatles song Yellow Submarine.
- The Hasbro toy, Barrel of Monkeys, appears on the title card.
- An element of this episode, Sandy's funding potentially being cut, bears similarities to the Mystery Science Theatre 3000 episode "Laserblast," in which Dr. Clayton Forrester's funding is cut, forcing him to disconnect the Satellite of Love and leaving Mike Nelson and the Bots to what Purple Doctorfish thinks will be an eventual demise.
- When SpongeBob looks in the mirror, he is wearing his water helmet; however, in the mirror, it is gone.
- In the closing credits to this episode, Christopher Ryan, who played Professor Percy, is mysteriously uncredited.
- If you look at Sandy playing her guitar, you see she's playing with her left hand. However, in other episodes like "Band Geeks," she plays with her right.
- When the machine spits out Lord Reginald, he is bald from the accident. However, when Professor Percy says to invent the Poop Thrower, Lord Reginald's hair is all grown back.
- When SpongeBob and Patrick say "It's here!," the closed-captions say "It's Eric!"
- Sandy said in the beginning of the episode that the chimps were coming that afternoon. When SpongeBob and Patrick want to help, they work all night, and the chimps come the next day.
- The phrase on SpongeBob's invention says "Dr. Professor Patrick Rulez!" However, the invention was finished before Patrick started calling himself "Mr. Dr. Prof. Patrick."