Iron Forged in Fire: Part One - S1-E1
Continuity mistake: When Tony says he has to stop the train from hitting the building’s power generators, the camera zooms in on a train car at the entrance of Stark Tower by the tracks that has the generators on it, and there are two Stark International employees standing on the balcony beside it dressed fully in white. Only a couple seconds later, Tony flies down there to cut off the train, and suddenly the two guys have vanished. (00:18:00)
Triumvirate of Terror! - S3-E8
Continuity mistake: When Joker zaps Wonder Woman and her mother, they are both standing in front of their thrones and fall forwards. But when Wonder Woman stands back up, her mother, still unconscious, is suddenly off to the side and behind the thrones. (00:11:35)
Continuity mistake: When Count Dooku is speaking to Riff Tamson via hologram, the clasp of Dooku's cloak is missing in one shot. (00:00:57)
Continuity mistake: When Angel is saying goodbye to Wolverine, the driver's side door of his car is open, and he is standing on the interior side of it. When the shot changes, you can see the door is now closed (note the window glare). (00:03:41)