While pestering Squidward Tentacles, SpongeBob SquarePants and Patrick Star find out that their heroes, Mermaid Man and Barnacle Boy, are in fact living in the Shady Shoals underwater retirement home, and they then attempt to bring the two, (Mermaid Man and Barnacle Boy) out of retirement, much to the annoyance of the geriatric Bikini Bottom superheroes who only want their TV to get fixed. Star and SquarePants go through all kinds of hilarious antics, including painting the Boatmobile to faking a purse robbery, to reunite their superhero pals and eventually succeed, thereby creating Mermaid Man and Barnacle Boy's new show: The New Adventures of Mermaid Man and Barnacle Boy.
The phone gets broken, and when Mermaid Man hangs up the phone, a comic book bubble appears and dramatizes the words "HANG UP!" When Mermaid Man sits down, the bubble appears again and says "SIT!!"Will our heroes ever get their phone fixed? Tune in next week and find out. And when SpongeBob winks, the bubble appears again, saying "WINK!"
This episode marks the very first appearance of Mermaid Man and Barnacle Boy.
Mermaid Man and Barnacle Boy have five fingers as youngsters, though as elders, they have four. This could be a technical fault since four fingered gloves were easier to draw.
When SpongeBob and Patrick are first asking the man at the front desk to see Mermaid Man and Barnacle Boy, an article on the inside of his newspaper reads, "School Drop Out Rate Soars." This has double meaning because "school" is also the name of a group of fish.
In the episode "Jellyfish Jam," Squidward said that SpongeBob is the only guy he knows who can have fun with a jellyfish, but in this episode he relaxes with a jellyfish. This may mean that this episode takes place after "Jellyfish Jam"
The ironic thing about this is that in most comic books, the dramatization of simple words usually comes in on action fighting scenes, but in this SpongeBob episode, it exaggerates the word dramatization as a reference to the 1960's Batman TV series.
When SpongeBob and Patrick are performing the "Burglar" attempt, the way SpongeBob says help, (Hay-ulp!) is a direct reference to The Perils of Penelope Pitstop, in which the main character; Penelope Pitstop's catchphrase is that exact line.
When Patrick takes the doughnut from the box, it is orange, but when they "unite," it is replaced with the chocolate one which was left in the box. After that scene, it changes to the normal doughnut again.
After Patrick takes SpongeBob's purse and peers out from behind the building, the purse is seen floating beside him.
Barnacle Boy puts the wrong ring on Mermaid Man's hand.
After Mermaid Man says the oath, both his and Barnacle Boy's rings disappear.
Mermaid Man illegally moves one of his checkers into a red space before the screen switches to "King Me!"
When Mermaid Man and Barnacle Boy say "Dog paddle, away!" and start dog paddling, you can clearly see Mermaid Man's socks are missing. Afterwards, they return.
When Mermaid Man says "Up, up and away" while rocking, Barnacle Boy appears to be saying it too, but with no voice.
Also, the animation appears wrong.
In this episode, Mermaid Man and Barnacle Boy are revealed to have come out of retirement but in later episodes they seem to be still staying in Shady Shoals, such as in "Night Light," "Mermaid Man & Barnacle Boy VI: The Motion Picture" and "Shuffleboarding."
When Mermaid Man says "To the broccoli!" His right bra strap turns orange for a split second.
After Mermaid Man and Barnacle Boy say "Dog Paddle away!" Mermaid Man is not wearing tights.
When Mable comes outside after Mermaid Man says, "sea creatures assemble," the bottom of her cane flashes white for 2 different frames.
In the GBA Video SpongeBob SquarePants Volume 2 Episode Menu the episode is mistakenly named "Mermaidman."