Although this film has an identical plot to "Mrs. Bixby and the Colonel's Coat" by Roald Dahl (later filmed by Alfred Hitchcock - Mrs. Bixby and the Colonel's Coat (1960)), the short story was published in 1959, three years after this film was made. Both are based on a popular anecdote that dates back to at least 1939.
Of the short subjects filmed by the New Wave directors from Cahiers Du Cinema before they graduated to features, this film was the first to use 35mm instead of the smaller format 16mm film they had previously worked with.