When Squidward decides to go live in the neighborhood of everyone that looks like him, when he goes to the store to get canned bread on the first day he is there, he parks his bike at the bike rack, but when he leaves the store, the bike is no longer there.
In the episode Grandma's Kisses, after Spongebob floods his grandma's house with his tears, she pinches his lips shut and tells him he doesn't have to be a baby. In the close-up he says, "I don't?" but his lips do not move in the reflection of the water.
When Grandma SquarePants drops SpongeBob off at the Krusty Krab, the steering wheel on her car is on the right hand side of the dashboard as opposed to the left.