In Rock Bottom, when the bus arrives, SpongeBob's arm is missing. His arm appears as soon as he starts walking on the bus.
When SpongeBob is supposed to pay the bus driver, he has no money (or at least he doesn't find it), but later he has money to buy a chocolate bar.
In the beginning of Rock Bottom, SpongeBob's mouth closes before he's done talking.
When SpongeBob and Patrick first get on the bus, there's another guy sleeping. When they're thrown to the back of the bus, they're the only ones there.
This set of episodes actually displays wrong in which they have a checkerboard pattern on edges, all across the intro to end credits of these 2 episodes specifically.