SonofMnemosyne
Floating Shopping List
I think that SpongeBob has continuity, but episodes are out of order in the "timeline". So the episode where Larry doesn't know SpongeBob could just be his first time meeting him, and episodes that took place before that where Larry and SpongeBob knew each other just happened after in the timeline.
This could make sense. If I had the time, I would try to put them all in order.