Trivia

Jack Hawkins was ill with cancer during filming. Shooting was shut down for several days.

Jack Hawkins, a chain smoker, underwent cobalt treatment after filming ended for what was described as a "secondary condition of the larynx".

The portrait of Hyde's wife (he comments "I regret to say the bitch is still going strong.") is a portrait of Deborah Kerr that was originally used in Vida y muerte del Coronel Blimp (1943).

After undergoing cobalt therapy when filming had ended Jack Hawkins cut back from smoking 60 cigarettes a day to five. However his cancer returned in 1964 while he was filming Los rifles de Batasi (1964).

A notable early portrayal of gay characters, although mostly heavily hinted at. The actors at the theatre are extremely campy, and one of the bank robbers appears to have left the Army possibly due to his sexuality.