The Return of Wonder Woman - S2-E1
Visible crew/equipment: While the jet is flying over the Bermuda Triangle the steward releases the gas into the air, and when Steve rushes toward him in the wideshot we can see a crew member wearing jeans and a blue shirt, at the right side of the screen.
The Return of Wonder Woman - S2-E1
Revealing mistake: During the scenes on the jet with Steve and the others, before landing on Paradise Island and when the Amazon women are aboard, the end of the cabin and cockpit sets are visible at either the right or left side of the screen in some shots (widescreen version).
The Return of Wonder Woman - S2-E1
Continuity mistake: Quite a few of the exterior shots of the jet which Steve is on are flipped shots (including the landing closeup), note the tail number "N207L" is backwards.
The Return of Wonder Woman - S2-E1
Factual error: When Steve gets attacked by the bad guys and Wonder Woman shows up, the lady in the car pulls out a camera and films the event. She sits still, the car isn't moving, and she does all the filming from the same position. However when she watches the playback, the film shows footage from multiple angles and varying distances, which is impossible because she and the camera were in the same spot the whole time.
The Return of Wonder Woman - S2-E1
Revealing mistake: After the steward releases the gas on the jet everyone passes out, and in the second exterior shot of the jet as it rocks from side to side, we can see the circular frame of the window from which the jet was being filmed, at the bottom right corner of the screen (this shot is flipped).
The Return of Wonder Woman - S2-E1
Revealing mistake: When Wonder Woman launches the robot away, the actor playing him is swapped for a rubber doll that bends awkwardly.
The Return of Wonder Woman - S2-E1
Revealing mistake: When Trevor's copycat is about to punch Wonder Woman, he is replaced by an obvious stunt double. The shot then cuts to the real actor, which underlines the difference between both.
The Return of Wonder Woman - S2-E1
Revealing mistake: The jet is supposedly taking a nosedive, but one can see the horizon line behind is also tilted, revealing the camera trick.
The Return of Wonder Woman - S2-E1
Continuity mistake: When the bad guys are beating Trevor's ass in the park and Wonder Woman spins around to transform herself, there's a man kneeling down behind her who disappears between shots.
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