Revealing mistake: When Diana is supposed to cut the power cables to stop the timer, just before she cuts the cable, you can see that all the cables are already cut and have a large, obvious seam in each of them. Then, when her hand goes through them, they all cut right at the seams.
Deliberate mistake: When Wonder Woman is bouncing around in the padded room, there's one part where you can tell the stunt double is not Wonder Woman.
Continuity mistake: When Wonder Woman tries to escape from the building, she's in the room with the padded floor and walls. Her heels are missing from her Wonder Woman boots, but they were on when she was in the hallway.
Continuity mistake: Diana is initially seen wearing a dark brown short-sleeved dress, but when she picks up the coffee, the dress inexplicably appears grey.
Continuity mistake: When Diana spins around, the computers are on. When she transforms herself into Wonder Woman, they're off.
Revealing mistake: Wonder Woman is in a control room with walls and a hard floor, but when she starts jumping around to avoid the lethal red light, the walls and floor swap to wrinkled and bending inwards, revealing it's a room covered with safety mats.
Continuity mistake: Diana puts the seatbelt on the robot. A shot later, it's gone.
Continuity mistake: Before Wonder Woman jumps on the bad guy, he runs past a rectangular lid on the ground. When she catches him, he is metres behind, next to the rectangular lid again.
Continuity mistake: When Diana opens the door, there's just a man cleaning the floor several metres ahead. A shot later, a man is rushing behind her. (00:04:50)
Continuity mistake: When Steve lands his plane, all you can see in the background is what looks like a wide open desert. However, when he comes to a stop, the jet is now in the middle of a completely different background and there was not sufficient time for it to go from the desert to this location in such a short distance.
Continuity mistake: When the episode begins, the people around the ping pong players change between shots. For example, look at the man in the brown swimsuit—he goes from walking into the pool to suddenly stepping out from the opposite end.
Continuity mistake: When Wonder Woman runs around the rooftops, the sky is cloudy and grey. When she jumps off to the ground, it's sunny. Then she lands, and it's back to cloudy.
Continuity mistake: When Diana exits the dark room, an officer immediately enters to check. A yellow tray suddenly appears, plus a big photograph on the right.
Continuity mistake: At the party, when the first ambassador watches the photo of him and his dead wife, the number of hands he holds it with swaps between shots. (00:01:40)
Continuity mistake: The amount of liquid in Diana's glass during the cocktail scene fluctuates inconsistently, depending on the camera angle.
Continuity mistake: When Wonder Woman runs to the parking space where the Polaroid lies, there's an old couple walking by who vanishes between instant cuts.
Continuity mistake: Wonder Woman has the bad guy lassoed; the rope is running below the coat of arms embroidered on his jacket. A shot later, the rope is above it.
Continuity mistake: Diana is wearing boots, but when she falls in the pit, they swap to black sneakers. When the gas comes out, they swap back to boots.
Continuity mistake: When Trevor holds the photo, there's nothing behind. In further shots, an envelope has appeared.
Continuity mistake: Trevor holds the Polaroid with his left hand, but in the wide angle, he holds it with both hands.
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