Revealing mistake: Wonder Woman jumps to a rooftop and sneaks through the skylight to spy on an office. A hole in the ceiling of the studio set gives away it's not the sky, but a set she's in. (00:33:00)
Revealing mistake: Both underwater scenes, which take place in the ocean, are of an obvious water tank, where the walls, tubes, and edges are visible.
Revealing mistake: The stock footage of the boat is a flipped shot. (00:37:10)
Revealing mistake: At timecode 00:32:04, Wonder Woman launches a thug up on a beam. One can easily see (and deliberately omit) that the shot has been played backwards and he really is falling down. The problem is, the shot is reused again at 00:32:24, though now it is played in its normal sequence and the man falls off the beam.
Revealing mistake: During the opening scene, when the cops follow the truck, skid marks from previous takes are visible.
Answer: The first actress, Cloris Leachman appeared in the TV movie which ended up being the pilot for the series. At the time, Leachman was already starring in her own TV series "Phyllis" (a spin off her role in "The Mary Tyler Moore Show"). This was actually the 2nd TV movie meant to be a pilot and the first one wasn't picked up. It's likely she thought the show would be picked up. After season 1, in which Carolyn Jones played the role, ABC was slow to make a decision to pick up the series for season 2 and CBS picked up the series. When CBS picked up the series, they changed the time setting of the show and replaced all the actors, with the exception of Carter and Waggoner (with Waggoner playing a different role technically), resulting in Beatrice Straight being cast.
Bishop73