When Capt. Hot Hips (Jesie St. James) and Capt. Jaybird (Paul Thomas) were caught having sex, Capt. Hot Hips said several words without ever moving her lips.
The flag behind Cpl. Specs's (Joey Silvera) bunk bed was Cowpens flag or 3rd Maryland flag from late 18th century US which was not in use during the time of Korean war when this movie was set in.
The announced movie "Hillbillys in a Haunted House" was not released until 1967 -- more than a decade too late to be shown during the Korean military action.