During the Volkmann/Dane motorbike chase, the stunt rider's SS cap is blown off as the Major jumps over a local peasant. It is back on his head in the next shot.
In the main attack scene in the village, a boy is seen crawling out from under the car. A couple of shots later the same scene is shown, but this time he is grabbed by the German officer.
A control room could not survive with an open window immediately behind a launching rocket.
A vehicle parked in the town square bears the insignia of the elite Grossdeutschland panzer division, which served on the Eastern Front and not in the Greek Islands.
In order to spoil the chase, Zeno cuts off hydraulic pipes of braking system under Volkswagen Kübelwagen car. However, this car had entirely mechanical brakes, without hydraulic liquid.
High-voltage wires cannot touch the ground.
Whichever small Greek island the camp is on is clearly in some backwater, with no immediate threat of enemy attack. This is even made clear from some dialog disparaging some guards, and the presence of barely-tolerated officers with non-combat skills like Major Otto Hecht (Roger Moore) in key positions.
Such units would never, ever get new and specialist weapons such as the StG 44, several of which are captured and clearly used on screen by main characters. In fact, such units would be issued a combination of old German First World War machine guns, and captured foreign weapons.
Such units would never, ever get new and specialist weapons such as the StG 44, several of which are captured and clearly used on screen by main characters. In fact, such units would be issued a combination of old German First World War machine guns, and captured foreign weapons.
Archaeological prison camp STALAG VII Z is introduced with a swooping aerial photography shot circling the entire complex, to end on a Red Cross ambulance arriving at the main gate. However, partway through this sequence as the large circular building comes into view, the ambulance can be seen parked on the road awaiting its cue.
Dottie faints after her underwater mission, yet is conscious enough to lift her hand to Hecht's help.
When Roger Moore is rescuing the female diver in his boat, he uses the anchor device to hit the German diver. When he returns the anchor to the boat, it bounces off the deck showing it was made of rubber.
In the monastery when the are bringing the missile out, you do not see any of the Luftwaffe soldiers controlling the motor unit pulling the missile out, yet when it is pulled away from under the missile, a cord it plugged into a socket on the wall.
In the motorbike chase scene, when Anthony Valentines character jumps over the washing line, you see his cap fly off, but when he lands and carry's on he is clearly wearing it again.
Elliot Gould wears a modern (1979) style NY Yankees cap with a high, structured "buckram." During WWII a softer, lower skull-fitting cap, the so-called "Brooklyn-style" cap, would have been appropriate.
Although the movie is set in 1944, Stefanie Powers is seen wearing a wet-suit jacket. The wet suit was not officially invented until 1952.
Richard Roundtree's character wears the shoulder patch of the US 8th Army, which served only in the Pacific theater in World War II.
While rappelling down to the monastery, there are ropes around everyone's legs, apparently indicating a period-correct "body belay" (providing enough friction to arrest the descent without simply using muscle power to climb down the role by hand), and uses what appears to be manila or hemp, also period correct.
However, the angles and editing are not that good and several times the actual belay equipment is visible. All the actors are wearing (hidden) nylon sit harnesses, to which are attached modern aluminum carabiniers allowing them to clip into (very modern in 1978) aluminum figure 8 belay devices.
However, the angles and editing are not that good and several times the actual belay equipment is visible. All the actors are wearing (hidden) nylon sit harnesses, to which are attached modern aluminum carabiniers allowing them to clip into (very modern in 1978) aluminum figure 8 belay devices.
Sonny Bono's and Elliot Gould's hairstyles are more of the 1970s than the 1940s.
At the end of the sequence where the monastery blows up, two massive expositions are seen but not heard.
When the German soldiers are marching around the middle before the executions, and marching past Roger Moore, who plays a Major, only some of them actually show correct military manners by turning their heads towards him. The rest are too concerned with counting their steps so they end up standing in the correct place.