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 they are in east Houston, Idaho, the helicopter gets knocked out of the air and lands upside down onto a jeep. You see the pilot get smashed into the seat of the jeep real hard and yet seconds later he walks away unharmed.
Continuity mistake: There is a scene in which it is raining quite heavily and Em and Richard are inside the hutch. Richard is playing Pop Goes The Weasel over and over which annoys Em. She stabs him in the foot and he chases her outside. In this scene she is wearing a strapless dress but when he catches her and pins her down on the sand she is wearing a lacey jacket (she didn't have time to change) and there are no clouds or rain. The sand doesn't seem to be very wet either, despite the fact that it was raining heavily a few minutes ago. (00:41:10)
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: During the placing and arming of the explosive probes, twice the probe being placed is a completely different number to the one that is then promptly armed.
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: In the bullfighting scene Herbie's driver-side running board is dented upward in the middle, but in the following scene it isn't there.
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: When Blackthorne tries to open the door in order to leave the room he woke up in, his hand tears the paper wall. The damage to the paper then changes between shots. (00:11:20)
Continuity mistake: At the beginning, when Voltan arrives on horseback at his fathers castle, it is daylight. We are then shown an exterior shot of the castle itself and it is pitch black. Then, a minute or so later, we see Hawk arriving on horseback at the castle and it is daylight again.
Continuity mistake: The amount of blood in the shower varies from shot to shot. One moment, it's ankle deep, then the drain is visible, then ankle deep again.