1. Nickelodeon tried to discourage the "Sailor Mouth" Episode
It was Stephen Hillenburg's idea. Nickelodeon tried to say no due to the fact he couldn't use "Bleeps" so he opted for the dolphin chirping and other nautical sounds.
2. Hillenburg did not really want the use of celebrities in cameos.
He thought it was too Simpsons-esque and did not want the show to be presented in that way.
3.Hillenburg also did not want 3 things to ever happen to the show.
1. Pearl's mom would never be revealed
2. Spongebob would never get his boating license
3. Spongebob would never have any crossover episodes or spinoffs.
Now that he's dead sadly they (Nickelodeon) are not living up to number 3 as a Kamp Koral spinoff is in development.
4. SpongeBob's personality is based off of Jerry Lewis and Pee-wee Herman.
Let's just hope Spongebob doesn't get arrested in a adult theater like Pee Wee did 😂
5.The idea for SpongeBob came from a comic Hillenburg made in college called The Intertidal Zone.
6.Hillenburg pitched the show to Nick with a Hawaiian shirt, music, and an underwater terrarium with models of the characters and it made a really great impression.
7.Carolyn Lawrence, the voice of Sandy Cheeks received a lot of letters from prison, she stated that it's her biggest fan base
Don't drop the soap Sandy ;)
8.Roger Bumpass, the voice of Squidward believes that Squidward actually likes SpongeBob, and "it only comes out in certain episodes though."
9.Patrick's character was initially conceived as a bully who was constantly angry about being pink. The show's creators quickly did away with this
10.Hillenburg says he hates when SpongeBob does promotional tie-ins with fast food brands. Whenever those promotions happen, Hillenburg has a rule that SpongeBob isn't allowed to directly interact with any of the products.
"[W]e didn't want to suddenly become the people serving up food that's not that good for you — especially kids," he told the New York Times.
11.Unlike most animated shows, SpongeBob records each episode with the whole cast together in room, instead of taping each actor separately.
12. Hillenburg actually hated the movie idea.
He finally gave in after a year and a half of Nickelodeon begging him.
13.According to Tom Kenny, there's a lot of improvisation between the cast during recording sessions: "We do try to add jokes, we do a scene a bunch of times, with as many variations as possible."
14.Hillenburg wrote the part of SpongeBob specifically for Tom Kenny, based on a voice he'd heard the actor do on Rocko's Modern Life.
“I don’t think anyone else even read for the part," Kenny once revealed. "SpongeBob SquarePants was the easiest job I ever got."
15.Hillenburg says he never expected the show to take off. He even once admitted in an interview: "I really figured we might get a season and a cult following, and that might be it."
I'm actually very surprised Stephen Hillenburg never thought Spongebob would ever get as big as it has. It's even more amazing that in a way he was against Nickelodeon turning it into a cash cow and kinda anti commercialist towards the show.