Terry-Thomas also performs his celebrated sketch "Technical Hitch" in this movie, which made him famous in the late 1940s.
The long sequence of silent film they watch is from Ça gaze (1929), which features Walter Forde as the man with the suitcase.
Basil Radford and Naunton Wayne have brief uncredited cameos as Major Bright and Captain Early, roles that they played inIt's Not Cricket (1949).