Continuity mistake: When Bartlett is on the run in the town a car containing Germans pulls up near him. Bartlett stops on the pavement but in the next shot he is standing in the middle of the road. (02:31:57)
Revealing mistake: When James Coburn and Charles Bronson are pretending to be Russian prisoners and attempting to walk out of the camp, if you look in the open windows of the huts in the background (past the men leaning out the windows), in several of the huts you can see that there is nothing inside, with wooden beams/braces visible to hold up the walls.
Visible crew/equipment: Late in the film, when the two escapees are boarding a bus, there's a studio lamp on a scissor-lift in plain sight at the left side of the screen. (02:37:00)
Factual error: As Steve McQueen is making his 'great escape', he drives his motorcycle through a gap which a chasing motorcycle and sidecar can't squeeze through, so it crashes. Cut to a crane shot of the retreating McQueen racing into the distance. Keep your eye on the left of frame and into view, on top of a building, is a distinctly un-1940s TV aerial. It's there for a full 7 seconds.
Continuity mistake: The position of the propeller crank changes between when Hendley first hands it to Colin and when Colin begins to crank it.
Continuity mistake: When Henley attacks the guard at the airport, the back of his jacket gets wet from rolling around on the ground fighting the guard (there are puddles visible). Yet a few moments later, when he is walking towards the plane, his jacket is dry. (Visible in widescreen DVD version - 2:25:26 to 2:25:56). (02:25:25 - 02:25:55)
Continuity mistake: In the scene where Ives attempts to climb over the barbed wire fence, a long shot shows Ives in foreground and a line of men, including Hilts, in the background. In this shot, Hilts notices Ives and begins to run towards him. In the next shot, a close up of the line, we see Hilts still standing motionless, before noticing Ives and beginning to run towards him. Again.
Other mistake: Ramsay sports on his tunic the ribbons for the Distinguished Service Order, the Military Cross, either the 1914 or 1914/15 Star, the British War Medal and the Victory Medal. Unfortunately, the ribbon bar for the last three has been sewn onto his tunic upside-down - it reads, left to right as seen, VM, BWM, Star, when it should read Star, BWM, VM.
Continuity mistake: While describing the escape process, Roger says that "Tom will run north from the 105." He is interrupted, then says, "as I said, Tom will run north from 104."
Character mistake: When Werner asks Hendley why, as an American, he fights alongside Britain, he mentions that the British burned down the U.S. capital in 1812. While it happened during the War of 1812, the burning of Washington actually occurred in 1814. (00:11:10)
Character mistake: When Werner goes to see Hedley for helping finding his "lost" papers, Hedley is playing chess. The chess set is set up incorrectly. When the men are set up properly, each player has a light colored square in the right-hand corner. In the movie, the game is set up so that the light-colored square is in each player's left-hand corner. This "beginner" mistake puts the king and queen in the wrong positions.
Revealing mistake: When Hilts is first locked in the cooler he turns to verify the door is locked. Apparently the set wall was so flimsy the stage hand seen on the left was required to hold the wall as Hilts pushed the door, to prevent it from moving. The stage hand looks like the German guard without his rifle.
Factual error: The entrance to tunnel Dick is shown improperly; the trap door was on the side of the drain basin, not the bottom. This was discussed in the Brickhill book, and subsequently verified by research on the site (shown on the US television program NOVA) which found the original door and its lifting handles.