Mitchell Leisen insisted that the stars drink real alcohol in the scene where Ray Milland tries to get Claudette Colbert drunk. The director concocted what Milland termed a "ghastly mixture" of creme de menthe and champagne. According to Milland, they got it right on the third take, but Leisen insisted on a fourth. Milland was able to stagger away, but Colbert and Walter Abel were so drunk that the studio ambulance had to take them home.
Even though the French-born Claudette Colbert could speak French fluently, when she had to speak French in the film as an American, she was able to do it with an American accent.
Director Mitchell Leisen was able to create an exact replica of Maxim's on a Paramount sound stage.
Cliff Navarro, the double-talking photographer, was a staple of comedy programs throughout the 1930s and 1940s. Most of his radio work was uncredited since he typically (but frequently) played small parts--the salesman giving nonsense explanations of how something works, the gas station attendant giving nonsense directions, etc.