Corrected entry: In the episode "Help Wanted" when Spongebob makes Krabby Patties for the anchovies, Spongebob chops lettuce, patties, and onions for some of the buns and the buns don't have patties, tomatoes, or cheese on them. When he's done dancing, when you look at the patty buns there is no onion, but there is a patty and lettuce. Also in later episodes, the way he made those patties isn't the way he makes them now. And the way he makes them now has tomatoes and cheese on them. But this could probably be wrong due to it being a pilot episode.
Corrected entry: Squidward spray painted "loser" pointing to his own face (which he also spray painted) on one of the front doors of the Krusty Krab. When Spongebob first goes into the Krusty Krab, the drawings (or whatever they were) disappear.