A pre-Seinfeld reference to the real-life "Soup Nazi": A male journalist is speaking as Meg Ryan enters an office at her newspaper, saying, "...he's the meanest guy in the world, but he makes the best soup you've ever eaten."
Mary Kelly was the name Sam Baldwin gave as the eighth girl he "made it with" in college. Mary A. Kelly is the Script Supervisor and also played a bit role as the nervous woman on the plane.
Nora Ephron:
When Meg Ryan's character is in the kitchen in the middle of the night listening to the 'best of' radio callers, the caller 'Disappointed in Denver' is voiced by Ephron.