Revealing mistake: The mock-up of Clancey's ship that we see from the town never matches the stock footage of the ship at sea. Nor, apparently, did budget restraints allow for any movement of the mock-up that would make it appear to actually be floating on water. It glides into port on what is obviously wheels, perfectly level, and without a single creak or groan that a real ship would make.
Here Come the Brides (1968)
1 revealing mistake in show generally - chronological order
Starring: David Soul, Robert Brown, Bobby Sherman, Bridget Hanley
Revealing mistake: When Stemple and Jason argue on the porch, an electric light bulb is very apparent in the lantern beside the door. (00:41:00)