The model car that George Loomis (Joseph Cotten) is making in the film is a 1907 Maxwell. This is a nod to co-star Don Wilson, who plays the boisterous businessman J.J. Kettering. Wilson was the longtime announcer on Jack Benny's radio show. On the show, Jack Benny's car was a 1907 Maxwell. Its sputtering, coughing, wheezing engine (a vocal sound effect provided by Mel Blanc) was a well-known recurring gag on the show.