When David begins to disassemble the machine in Mr. Foreman's machine shop, he places the parts in a wooden box that is sitting on the table. You can also see a paper tag already in the box. After speaking with Wanda on the telephone, he returns to disassembling the machine, but the box is no longer present and he has to retrieve it from underneath the table. The paper tag has also returned to the machine and he places it in the box again.
At the beginning of the film there is a cropped image of Tyrone Power on the cover of the January 1938 edition of Photoplay magazine. He was actually on the cover of the December 1938 edition. Irene Dunne was on the cover in January that year.
David admires a poster for the movie Lost Horizon (1937), which was released in late Thirties when story takes place. But bottom of poster identifies movie as a re-release, something that wouldn't have taken place until years later.
The story takes place in 1938, but all the women's hairstyles, particularly those of Elaine May and Nancy Kovack, are strictly 1967.
After the first rehearsal at the theater as David leaves with his girlfriend, they pass a poster on the front of the theater advertising "Fiddler on the Roof", a musical production done three decades after this film takes place.
David, who recites lines solely from movies, recites one from Gunga Din (1939), which was released in 1939. This movie takes place in 1938.
Although set in 1938, the woman on the train is reading the June 3, 1939 edition of Collier's magazine.