Other mistake: When Shapiro goes to get the teabag out for Dunbar's tea, you can see that there is a wet spot where it was in his pocket, suggesting multiple takes.
Suggested correction: Or he'd simply used the teabag before using it in Dunbar's tea.
Continuity mistake: When Price gets his "love note" out of the black queen and reads it, he quickly puts it and the queen in his left pants pocket. However, later Sefton reaches into Price's jacket and gets it out.
Suggested correction: It's the next day. It's perfectly reasonable that Price could have moved it. It's also reasonable that Sefton, who was watching him closely, would have seen where he put it.
Factual error: At the start when Manfriedi and Johnson are ambushed outside the wire, check out the "German" crew served machine gun. It is actually a U.S. mod. 1919 air cooled 30 Cal. Browning. Germans used MG 34 and later MG 42s. But for a rear area POW camp they would surely use 34s to save the newer faster 42s for the front.
Suggested correction: Captured weapons would have been used because it would have been even cheaper than using 34s.
Other mistake: 2 prisoners from barrack 2 bring in a phonograph for the exchange of Sgt Sefton's brew distillery, but where is the music coming from, given the phonograph is fake?
Suggested correction: The phonograph isn't fake. Why would they exchange a fake phonograph for a working distillery?