Doris Day wrote in her autobiography that she only encountered trouble or tension on two of her Warner Bros. movies: 'April in Paris' and Young at Heart (1954). Regarding this film, she claimed that leading man Ray Bolger and director David Butler clashed early on, with Butler accusing Bolger of trying to steal scenes away from Day. She also mentioned that being a relative newcomer to movies, she was unaware of Bolger's tricks and managed to stay out of the line of fire.
The request for the Captain's long talk to be boiled down for Reader's Digest is a reference to Reader's Digest Condensed Books, which were very popular in the postwar years.
Despite the title, the characters don't reach France until 1 hour and 15 minutes into the film, and only the last 25 minutes are spent in Paris.
Apart from the stock establishment shots, all of Paris was created on the Warner Brothers Studio back lot.
A colorful poodle would once again appear a few years later in "Will Success Spoil Rock Hunter?" as Jayne Mansfield's canine companion, Shamroy. Rainbow dyed pooches were a Hollywood fad at the time.