Continuity mistake: In many of the early episodes Miss Jane drives a 1962 Plymouth convertible, but gets out of a 1963 or 1964 Dodge.
Continuity mistake: Halfway through the show, they get caught not having the boat, and McHale gets taken by boat to the commander's office. As he leaves the pier, he drops the rope on the seat next to him, they do a close-up and the rope is behind him about 5 feet away.
Continuity mistake: At the end of this episode Harold picks up a knife and chases Albert round the table with the knife in his right hand, but when the door bell rings the knife has disappeared.
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Suggested correction: The knife doesn't disappear he actually drops it if you listen carefully.