In the episode "Spongebob Meets the Strangler," Spongebob comes back from doing errands and loses his keys, so he tries to get in different ways, then he pulls a key from under the mat, when 30 seconds ago, there was no mat!
Well,the people who make sponge bob would probably do this because if they put the mat there when they first arrive, the audience would probably know that there is a spare key under the mat. So the creators put the mat there later so it would be funnier after the 3 hours that spongebob took to just get the key from under the mat. Still i think this counts as a slip-up.
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