Goofs

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

Numerous early scenes in this film inexplicably switch from day to night, especially during car chases.

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

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.

While David is pursuing 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.

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.

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

Hitler committed suicide by shooting himself in the mouth. As a result, there would not be much left of his brain to save.

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

The grenade damage to the Nazis' Aeronca Champ airplane is totally unrealistic. The Champ is built using a strong tubular steel space frame covered in fabric. A real explosion near an aircraft of this type should blow large holes in the fabric while leaving the steel space frame intact but exposed.

The filmmakers apparently unbolted the wings and wing struts, laid them on the ground, and temporarily attached fabric or paper scraps to them to make the airplane appear badly damaged without actually inflicting significant and hard-to-repair damage to it; if the fuselage and wing fabric had actually been substantially torn, repairing it would have taken days and cost far more than simply bolting the wings and struts back on.

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

Obvious stock footage - the exterior shot of the Mandoras airport shows cars driving on the left-hand side of the road. However, subsequent scenes shot for the movie 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 bulkier and has a different engine cowling shape and landing gear configuration than the airplane subsequently shown on the ground.

There is a picture of President Dwight D. Eisenhower in Russ's office in CID Headquarters; however, Phil drives a 1962 Ford and Toni drives a 1968 (or later) Volkswagen Beetle, cars that were not made until the John F. Kennedy and Lyndon B. Johnson administrations, respectively. This reveals the scant attention paid to the original film version's timeline when the later TV edits were shot and the scenes with Russ and Toni were added in.

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.

None of the 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.

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

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

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 assailant's car pulling up next to her car and firing a loud gunshot.

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.

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.