Revealing mistake: At the start of digging the tunnel, one of the characters (I think Denny) calls Woody Allen, "Woody" by accident.
Continuity mistake: During the party, Chi Chi starts off wearing pants, then she has a dress on, then it goes back to pants.
Factual error: Easy to spot. The chocolates are referred to as Belgian at the beginning of the movie, but you can see they are in fact Baci by Perugina (from Italy).
