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)
Continuity mistake: When Captain Drazak arrives at the camp carrying the bodies of the bandaged men, he passes in front of the child. The child makes fun with his right hand, but in the next shot, from behind, the child uses his left hand.
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.
Factual error: The Force 10 finally manage to escape of the German ammunition depot by train. However, when the train leaves the tunnel and the men jump off the train the engine is a modern red and white electric locomotive. Only one problem: Electric trains did not exist in Yugoslavia until 10 years later. The engine is a mid-60's Swedish type RC.
Visible crew/equipment: About midway in the movie, in the German ammunition plant, a couple of workers are sliding ammo crates on Rapistan skatewheel conveyor. This particular conveyor was not invented for another 35 or so years (1978).