Revealing mistake: Wonder Woman lifts the rear of the toy maker's van. During the pan from the rear wheel to Wonder Woman you can see the jack holding the van up.
Revealing mistake: When the toy aeroplane, which is supposed to be remote-controlled, attacks Wonder Woman, in a closeup shot you can see the wires which are actually controlling it.
Revealing mistake: When the scientist melts and collapses on the table, the wires controlling the dummy are visible.
Continuity mistake: Wonder Woman throws her boomerang tiara, which falls down half a metre ahead. The shot changes and it's now flying up in the air for over 10 metres.
Continuity mistake: When Wonder Woman spins around and transforms herself, the sunlight swaps from dark to bright.
Continuity mistake: When Wonder Woman jumps from the rooftop down to the floor, the wall swaps between being lit by the sun and being in the shadows. (00:06:40)
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