Some cast members in studio records/casting call lists did not appear or were not identifiable in the movie. These were (with their character names): Marie Blake (Telephone Operator), Harvey Clark (Artist), Dorothy Vaughan (Matron), Jerome Storm (Poolroom Man), Francis X. Bushman Jr. (Young Man at Fight) and Irving Bacon (Drug Clerk).
Explain it to her, Jimmy.
Jimmy Kilmartin: Well, it's like this...
Meg Swift: That's enough, Jimmy. When anything starts, "Well, it's like this," you can't explain it.
When Alan unexpectedly drops in at Mimi's apartment after meeting Jimmy at the club, a moving shadow of the boom microphone is visible along the top of the open door to the apartment.