Corrected entry: In "Squilliam Returns", when Spongebob erases everything from his mind, (except fine dining and breathing) his brain is shown shredding papers. When his brain shreds memory, one paper shredded is entitled "Spice Garden Tips". Later when Squilliam arrives, Spongebob serves him the "Krabby Newburg" which he says, "contains herbs from our garden". But if Spongebob forgot his "Spice Garden Tips", he would not be able to prepare that dish.
Corrected entry: In "Squilliam Returns", when Squidward gives up on everyone and runs out of the Krusty Krab, he runs into Squilliam. If you look at the shown window of the KK, it is the ordinary window with the ropes on it. But when they walk in, wallpaper covers all of the windows. I know that Spongebob converted the restaurant from crappy to fancy very quick, but I think we would've seen him placing wallpaper on the windows.