Winston Churchill hated the film and wanted it banned. Failing that (for legal reasons), he tried to keep it from being exported because he thought it was a threat to wartime morale, and he also failed at that.
Colonel Blimp was a British cartoon character in a then well-known strip. The producers decided to use the name for the movie.
Director Michael Powell was intrigued by how second-unit cameraman Jack Cardiff was filming the animal heads and gave Cardiff his first big break as the cinematographer on his next film, A Matter of Life and Death (1946).
Three-quarters of the Germans in the crowd at the POW camp are carefully painted and positioned plaster models.
At the end, when the camera zooms in on the tapestry, the Latin phrase "Sic Transit Gloria Candy" is shown. This translates as, "Thus passes away the glory of Candy."