During a gathering at Frank Sinatra's parents' house, the gathering starts singing happy birthday for Frank, while Frank's father is listening to a radio broadcast about the Japanese attack on Pearl Harbor on December 7th, 1941. Frank Sinatra's actual birthday is December 12th.
Exterior of Hollywood Palladium looks as it did following an early Sixties remodel, not the original streamline moderne style of 1940 in which scene takes place.
When Frank is giving Nancy a driving lesson, reflection of camera crew is visible on side of car as she pulls over to park.