The last scene in the episode, when Betty contacts Dan following Steve's recovery, must have been recorded early, as most of the toadstool dust on his uniform had been brushed off throughout the episode. In the final scene it all reappears again.
When the giants enter the abandoned office and check the heating vent, the telephone that had been on the floor near the heating vent has disappeared.
The Police Officer is referred to as a "Sergeant" but wears the rank of a U.S. Navy Chief Warrant Officer-3 (CWO-3).