Continuity mistake: When Hendley and Blythe get into the German aircraft first, the cockpit is tiny and cramped, like you'd expect. However, when they cut to the studio-done flying scenes, it suddenly becomes much larger, nice and roomy.
Continuity mistake: In the scene involving Hilts and his baseball directly after Sedgwick and Haynes have their sham fight, Hilts drops his canvas bag with his name on it on the ground. When Goff comes to join Hilts, however, the canvas bag is nowhere to be seen. Despite the angle it would have been seen as the bag was placed down horizontally. (00:13:35)
Continuity mistake: When Hilts tests his blind spot theory at the wire and is caught by the German guards, in one shot he points at the wire with his thumb. In the very next shot, his arm is instantly resting on his hip. (00:20:00)
Continuity mistake: In the scene where Hilts is first locked in the cooler, he is eventually let out. It shows him walking out from a view that is inside the cooler, and his coat is on one arm (I forget which arm it is). Then it shows a view from outside of the cooler,of him walking out, and his jacket is on the other arm. He didn't switch it while walking, because the clip is about 2 seconds long.
Continuity mistake: In the famous scene when Steve McQueen jumps the fence, the stuntman riding the motorcycle loses control of the motorcycle shortly after landing and he obviously fell off the motorcycle. They then cut to a scene of Steve McQueen riding off.
Answer: It's German, although I can't quite make it all out. The Germans tell him to stop (sounds like one says "hey you" in English). He asks what this is all about and, in English, the soldier accuses him of being English. Bartlett acts offended at the idea, and at being threatened with a pistol. The soldier then asks if he's German, he says something in the affirmative, and the soldiers apologize as they climb back in the car.
It sounds like the last line from the German Officer is" Free to Go" in English.