Continuity mistake: In the original 1980 version, in the first wideshot of Darth Vader's Star Destroyer, the light of a Star Destroyer can be seen on the right side just flying through space. This is fixed in the 2004 DVD release.
Continuity mistake: When Superman starts playing hide and seek with the villains, he stands away from the icicles. When Ursa shows up a frame later, he's leaning against them.
Continuity mistake: The egg timer in the jail is about to run out, but when Dale runs over to it and tries to turn it over, there is more sand in it than before.
Continuity mistake: When Lasky heads toward the conning tower, an A-7 Corsair is shown at left (and the helicopter nose has a number "3" on it). As he is led inside the tower, the camera pans up, and now the Corsair is gone, replaced by an E-2 Hawkeye (and the number "3" on the heli is gone, too). (00:06:45)
Continuity mistake: When Adam switches on the monitor to view Hector trapped in the lab, Hector is seen ripping a piece of the door off. Adam then asks Benson about emergency procedure. When the shot cuts back to the monitor, Hector is ripping the same piece off the door again; it's the same footage. Also, when the three humans force their way into the lab afterwards, the damage done to the door is not the same as they viewed on the monitor. (00:45:25)
Continuity mistake: While Puma Man is flying away from the mansion and Kobras tries to take over his mind, Vadinho is in the grounds surrounding the mansion, quite a bit outside the city limits. However, when Puma Man crash lands downtown, Vadinho is in the same building, with no time to get there.
Continuity mistake: David's boss is driving him after the visit to the herpetologist. In the middle of the conversation the passenger's window goes from all the way up to halfway open and back to closed again. (00:30:50)
Continuity mistake: When Shad and Nanelia are kissing, her right ear is covered by her hair, in the next shot her hair is now tucked behind her ear, and in the next shot, her ear is now covered again.
Continuity mistake: At the beginning during the house gathering, the toilet seat is up while Arthur is gathering ice from a bag that is in the bathtub. We cut to a shot of Emily and then back to Arthur, where the toilet seat is down. (00:06:40)