Factual error: The Germans in the castle are using Bell 47 helicopters which, apart from being manufactured by the enemy, did not even appear until after the war.

Factual error: In the courtyard of the castle there is an anti-aircraft gun. You could probably not find a worse place for a gun like that even if you tried (except maybe if you put it inside, in a windowless room). In the position it is placed it can only fire at targets directly ABOVE the castle. What you want to do is fire at targets BEFORE they reach the castle. It would be better if they placed it on the roof, or even near the village below.

Continuity: When Smith is driving the bus, there are at one point several bullet holes in the bus' windscreen and in the next shot they have vanished.

Revealing: When the Allies are dropped from the plane into the snow and they find the dead soldier. Watch close, because the dead soldier blinks his eyes...

Revealing: When the bus is being pursued, Smith steers it to trip several prepositioned explosives that blow up trees to block the road. In order to by pass a downed tree the Germans push a motorcycle around it, and you can plainly see that the tree was cut by a chainsaw. (Time)

Revealing: As the spy troupe prepares to leave by airplane, a Kübelwagen with soldiers comes up, which Burton shoots with his MP40. As the car bursts into flames, the driver and passengers are revealed as dummies, since no one could or would sit around quietly while they were on fire.

Continuity: When Mary and Schaffer are firing the MP-40s from the back of the bus, a shot from outside of the bus shows the rear windshield broken/cracked one way but in the next shot from inside the bus looking out the rear windshield is broken/cracked differently. (Time)

Factual error: The aircraft at the Luftwaffe airfield at the end of the field look like US Harvard trainers.

Continuity: Smith puts on one glove just before he hops onto the cable car with the two German spies. The next shot shows him with two gloves on.

Continuity: The car that Schaffer and Smith are riding in with the Germans is launched in the air by hitting a pile of snow and then comes to a sudden stop by hitting a pile of gravel where the Germans are killed. What happened to the pile of snow when Schaffer and Smith push the car backwards?

Continuity: When Schaffer and Smith commandeer a motorcycle and sidecar, one shot shows the MP-40 slung over Schaffer's neck and laying across his lap, while in the next shot it is slung over left shoulder and hanging down his side. (Time)

Revealing: After Smith and Schaffer are captured and while they are being transported by car, Schaffer pushes one of the guards out of the car and a struggle begins which causes the car to crash. After the crash, the body of the guard that was pushed out of the car magically appears about 50 feet behind the accident (just before the crash there was no body). (Time)

Factual error: In the flashback scene where the commandos are being briefed on their mission, they are told that General Carmody was on his way to a meeting with Russian officers on Crete. Hardly the best place for a meeting between the Allies since Crete was then under German occupation.

Factual error: In the scene where Clint Eastwood's character is sneaking up in the German soldier in the radio room in the castle, you see and hear the soldier changing radio station channels. Most of the music you hear playing on the radio is distinctly a 1960's style easy listening music and not 1940's music.

Continuity: As Mary is starting the rappel down the rope out of the castle, her MP-40 is slung on her right side with the muzzle pointing forward, but in the next shot it is slung across her back with the muzzle pointing to her left. (Time)

Continuity: After Smith and Schaeffer are done rigging the trees and poles with explosives, Schaeffer gets off the motorcycle and you can see the seat of his pants is wet. As they are entering the shed, the seat of his pants is now dry.

Visible crew/equipment: In the scene where the Germans are pursuing Richard Burton's escaping party as they make their way towards the aircraft waiting for them, you will see the first of two pursuing German Kubelwagons being hit with machine gun fire and flipping. When this happens, you will see a cable used to flip the vehicle on the bottom left side of the screen being quickly retracted as it becomes detached from the Kubelwagon's axle.

Other: In the scene where Smith and Schaffer are riding with the SS in the staff car, after the car hits the snow bank, Smith picks up the SS Colonel and puts him back in the car. The Colonel is wearing a Major's collar tabs.

Factual error: As the coach moves through the village near the end of the film, it drives past a tracked vehicle. The vehicle is a Hotchkiss LPz, a type of armoured personnel carrier not produced until the 1960s.

Factual error: Schaffer and Smith are captured and the Nazis are taking them away in a car. After some fighting, the car crashes. While the Nazis fly through the vehicle's windshield, our heroes sit like they had seatbelts, which they didn't.