While sandboarding, SpongeBob does a stunt called, "the grouchy Squidward". While doing this stunt, he almost crashes into a tree. Then, he crashes into the ground butt-first because Sandy says it will hurt less, and is taken to the hospital.
Dr. Forrest says that it took 20 hours to glue it back together, and that if he has another similar injury, he may end up with an "iron butt", a huge machine on wheels connected to where the butt used to be. SpongeBob goes on "around-the-clock butt patrol", and after seeing many potentially dangerous things outside decides to stay home forever with his three friends, "Chip", "Penny", and "Used Napkin". Sandy and Patrick try to persuade to get SpongeBob to come outside, which are to no avail until they attempt to stage a fake gorilla attack. SpongeBob is unconvinced by this, until an actual (live-action) gorilla appears and attacks them. SpongeBob leaves the safety of his home to save his friends, but is easily defeated by the gorilla. The episode ends with a massive non-sequitur: When SpongeBob asks how a gorilla can exist underwater, the gorilla says "George, they're on to us!" and runs away on George The Zebra. Then, a family who was watching the episode get confused and turn it off.
I can turn into a skyscraper!
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SpongeBob's reclusive actions are similar to Howard Hughes. Although, Howard Hughes never left his house because he was afraid of germs, not injuries.
This episode shows a lot of live action characters including the Gorilla, George, and the people who were watching the television.
Before the "second Patrick" arrives, the real Patrick in a gorilla suit can be seen dancing similar to the Philippine novelty dance Otso-otso
Near the middle of the episode, SpongeBob talks before his mouth moves.
SpongeBob's X-ray shows he was taped up with a lot of tape, but the doctor said he put it together with glue.
Just before the old person says "I say we take a bath", SpongeBob's socks are missing.
After SpongeBob Sang "Indoors", Patrick can be seen crying. However, he disappears as Sandy points to SpongeBob.
When SpongeBob uses the 7 in, 23 cm long spatula, The Krusty Krab is to the east of his house, But it is usually to the west.
When Patrick and Sandy enter SpongeBob's house, Patrick's right eyebrow flickers red for a fraction of a second.
When SpongeBob says "No problem", Penny, Used Napkin and Chip are missing.
Squidward is seen calmly watering his plants during the gorilla attack. He would have ran into his house as soon as he saw the gorilla, way before the viewers would even have a chance to see him. Or at least be watching in shock. The writers must have forgotten about the gorilla when thinking of the joke, and decided it was so funny they had to put it in anyway.
Before the dust collecting scene his window is circle, but after it is oval-shaped.
The Gorilla is slightly see-through.
When Patrick is about to hit the sand mountain, his sled disappears.
The Krusty Krab is in the wrong direction. It is usually on the left of Spongebob's house not the right.