Visible crew/equipment: The first time Hilts (Steve McQueen) is locked up, you can clearly see the edge of the wall, and to the left a stage hand moving. (00:23:25)
Visible crew/equipment: In the scene where everyone is lining up to receive the moonshine that the Americans made you can see a crew member on the left hand side. He is wearing a red baseball cap and modern clothes. He is motioning for the extras to go into the main shot to get the alcohol. (Widescreen edition).
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)
Visible crew/equipment: In the scene where the POW's are lined up outside the next day after the escape, several large movie lamps are visible on the left side (widescreen DVD version only - at 2:05:51 to 2:06:16 and again at 2:06:36 to 2:06:40). (02:05:50 - 02:06:35)
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.