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
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 Man Who Could Move the World - S2-E3
Revealing mistake: When Ishida lifts the phone up in the air using his mind, the cable is visible.
The Bermuda Triangle Crisis - S2-E4
Revealing mistake: When Wonder Woman drops a mine into the water, she's supposed to be dropping it into the ocean. However, you can see a drain plug of some sort in the background and the "ocean" is obviously a pool, or similar.
The Bermuda Triangle Crisis - S2-E4
Revealing mistake: When Wonder Woman spins to transform from her wetsuit back to her costume, it's the previous transformation played backwards. Check how she moves counterclockwise and how her hair moves unnaturally.
I Do, I Do - S2-E8
Revealing mistake: When Wonder Woman starts running down the golf course chasing the buggy, one can tell it's a stunt woman.
The Man Who Made Volcanoes - S2-E9
Revealing mistake: When Wonder Woman is about to be crushed by the moving wall, one can see the white edge of the set on the left.
The Man Who Made Volcanoes - S2-E9
Revealing mistake: The scientists are watching an earthquake on a mountain with a Richter magnitude of 8.4. However, the rocks don't move a single inch, revealing it's a camera trick.
Mind Stealers from Outer Space: Part 1 - S2-E10
Revealing mistake: Before the red truck goes over the cliff, skid marks from previous takes are on the road where the police car is.
Mind Stealers from Outer Space: Part 1 - S2-E10
Revealing mistake: When Skrill busts through the door, it has no hinges, revealing it's a prop to allow for the stunt.
Mind Stealers from Outer Space: Part 1 - S2-E10
Revealing mistake: When Wonder Woman fights against the twin women, they are replaced with two tall stunts with blatant wigs.
Mind Stealers from Outer Space: Part 1 - S2-E10
Revealing mistake: When Wonder Woman is in the woods and leaps upwards to the tree branch, one can tell it's not the real actress but a stunt double. This is also very noticeable during the junkyard chase, too.
Mind Stealers from Outer Space: Part 1 - S2-E10
Revealing mistake: When the couple in the woods is paralyzed by the aliens, they can't help but move all the time, and even the woman's arms change positions between shots.
Mind Stealers from Outer Space: Part 1 - S2-E10
Revealing mistake: When the truck rolls down the hill, it crashes against another truck, which happens to match the shiny red colour of the original truck that went over the hill (not the faded red truck that we saw falling). Seemingly, it belonged to a first take.
Mind Stealers from Outer Space: Part 2 - S2-E11
Revealing mistake: Before Skrill breaks the log fence, one can see it's already cut.
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.
Answer: Yes, on the first episode of season 2, she is shown on the island, when another plane crash lands, she says, "They sound different from WW II". Later in the same episode a woman gathers background information on Wonder Woman. The woman says, "From 1942 to 1945, she helped the Allies win the war."