Revealing mistake: When the blonde stripper slaps the brunette slapper, for calling her "leftovers," in the closeup of the brunette being slapped, the hand is that of a male; very rough and hairy, and not the blonde stripper's.
Revealing mistake: Godzilla just reached the coast and is fighting a horde of toy tanks. When she sets foot on the base and swings her tail at the control tower, you can see that the tower is pre-broken in the middle, already all cracked and ready to fall apart at the center when Godzilla barely touched the tip. (00:15:10)