Continuity mistake: When every one in the rough tub bar are told to line up, SpongeBob is standing next to a fish with an eyepatch. When showed from behind the fish is orange but is later dark green.
Factual error: King Neptune's crown changes size when Plankton steals it and when SpongeBob and Patrick retrieve it.
Chosen answer: The movie is not in continuity with the series.
MasterOfAll