Jay Lawrence's brother, Larry Storch, was one of the stars of the war TV series "F Troop."

Although it is difficult to tell for sure because the movie is in B&W it appears that the Commandant & guard staff are members of the Wehrmacht(regular army). Due to the extensive bombing campaign there was intense anger toward allied flyers many of whom were immediately killed upon capture; therefore POW camps containing fliers were guarded by the Luftwaffe(air force). It was felt fellow airman would be more empathic and treat the prisoners better.

At the Christmas party, the POW singing "I Love You" is Ross Bagdasarian, who under his stage name David Seville, created Alvin and the Chipmunks. Submitted by Cubs Fan

In the scene were Blondie is using the radio, the message he is intercepting is about the Battle of the Bulge.

Charlton Heston was director Billy Wilder's original choice to play Sefton.