Revealing mistake: In one of the river flooding scenes after the dam bursts, you can see a modern day vehicle (most likely a pickup truck) for a few seconds on a highway next to the river. (01:50:30)
Revealing mistake: Near the beginning of the film, when the team are cutting through the wire to steal an aircraft, look closely at the Lancaster bomber in the background. It is obviously a cardboard cutout.
Revealing mistake: When Mallory, Miller and the others capture a German Schützenpanzer to infiltrate the train station for explosives, the wire they have strung across the road cuts off the head of a dummy.
Revealing mistake: When Harrison Ford and Robert Shaw are preparing to blow up the dam in the tunnel, they insert their detonators into what is supposed to be plastic explosive, but looks rather more like Styrofoam painted brown.
