Goofs

Only Hitler's head is shown to be removed, yet while he is attached to the machine, his shoulders are often visible.

When Phil and Kathy put the dead man's body in the phone booth, the body is leaning so that his shoulders are resting on the far side of the booth. When a woman opens the phone booth's door a minute later, the body falls out as if its shoulders were propped up against the door.

As David pursues the Days after they leave El Presidente Padua's compound, David's car has both pairs of headlights illuminated in exterior shots, but the interior shots of Phil and Kathy show only one pair of headlights behind them.

During Maria's dance, the proximity of the musicians to one another varies with the camera angle.

As they leave El Presidente Padua's compound, Dr. Coleman gets in Phil Day's car per his suggestion, yet Dr. Coleman is shown riding in the other car during the ensuing chase.

Hitler's "German" dialogue in the flashback is actually gibberish.

The first time Hitler's disembodied head is revealed to the Days in South America, it is beneath a large left-handed swastika (arms pointing counterclockwise). The correct Nazi insignia (used elsewhere in the film) is the right-handed swastika.

Many "nighttime" scenes in this film were obviously shot in bright, shadow-casting daylight (with dubbed cricket chirping on the soundtrack).

Obvious stock footage - when Phil and Kathy fly to Mandoras, the airliner shown flying has a very different paint scheme than the airliner shown landing.

Obvious stock footage - the exterior shot of the Mandoras airport shows traffic driving on the left-hand side of the road. However, subsequent scenes depict cars driving on the right-hand side of the road in Mandoras, and all cars have steering wheels on the left as is normal in a country with right-hand traffic.

Obvious stock footage - when the Nazi generals arrive, the airplane shown flying is obviously different than one later shown on the ground; it has a dissimilar engine cowling shape, landing gear configuration, and paint scheme.

In most of the interior driving sequences, the hood style and color of the car do not match the car that the characters are supposedly driving.

At the end of the Crown International Pictures logo that opens the film, the first few seconds of the opening theme music for The Devil's Hand (1961) (performed by Baker Harris and the Knightmares), an earlier Crown International release, is accidentally left in right before the opening credits begin.

When two Nazis enter the Professor's torture room, Suzanne gasps, though she is shown saying "Dave!" (a line from later in the scene).

None of the visible characters' lips move when the question "How far does it travel?" is asked during Dr. Coleman's G-gas briefing. As the men subsequently leave, it is clear that no other characters were elsewhere in the room.

During Maria's dance, a piano can be heard, but none of the actors are seen playing the piano on stage.

The instruments heard in the rock 'n' roll song being played when the characters arrive at Las Dos Palabras do not match the instruments used by the actors. This is most apparent when Suzanne stops dancing; the actor to her left is playing a trumpet, but no trumpet can be heard in the song.

Kathy does not realize that the man sitting next to her in the car has been shot until she sees the gunshot wound, despite the assailants pulling up next to her car and firing a loud gunshot.

As David pursues Phil and Kathy in the village, Phil states that David's Luger pistol only holds eight bullets, but David is actually holding a Walther P.38 at the time.

When Dvorak orders the soldier to get the car, the soldier performs an American-style hand salute to the forehead, rather than an outstretched-arm Nazi salute.