Revealing mistake: Most of the posed, fake displays in the ape's Museum of Natural History contain real people who are slightly moving if one pays careful attention. Especially noticeable are those posing with objects held in - or above - their hands.
Revealing mistake: After the accident with the German car crashing into the pile of snow in which the Germans were killed, Schaffer first hangs an MP40 on his shoulder and then somehow pulls up a body with only one hand. And with the changing of the grip, (from chest to legs) the 'body' stands on his own feet to give Schaffer the time and opportunity to do it properly. (00:50:10)
Suggested correction: Schaffer uses two hands to pick the body up his left hand grabs the body's right arm and his right hand grabs the body's tunic (under the body's chin).
Revealing mistake: Except for the one that crashes, every single helicopter in this film is 100% factory fresh, brand new - no mud spatters, no scratched paint, not a dent or a blemish anywhere. They look like they just rolled off the production line. Strange that, on the front line in a war zone and all.
Revealing mistake: Jack Elam gets bothered by a fly crawling over his face (nice stunt, actually). When the fly moves over the bench, just before he catches it with the muzzle of his gun, look at the hind legs. You'll notice that the fly is dead. (00:07:50)
Revealing mistake: When Bullitt is in the Coffee Contata restaurant, he called Delgetti at the grungy hotel. Bullitt didn't look at a note for the supposedly unfamiliar phone number, but it seems as if the number wouldn't take much to remember, either. The number Bullitt dials on the rotary phone sounds as if it is made up of only the digits 1, 2 and maybe a 3, to not slow down the sequence.
Revealing mistake: Despite being supposedly close to the North Pole, we never see the actors breath and their shadows should be long, but they are very short.
Revealing mistake: After Freya and Matt escape from Contini's chateau and are flying in Matt's chopper, we can see the shadow of their chopper being cast on the ground below, but the problem is that Matt's chopper looks nothing like that helicopter's shadow.