Editing goof: When Niles and Daphne are on the phone at the end, and she tells him the truth about the photo, in the next shot Niles has suddenly hung up his phone and is looking at the photo. A few "deleted seconds" perhaps?
Frasier: Would we sleep together?
Lilith: I thought we'd freeze your sperm.
Frasier: Is that a yes or a no?
Niles: I have a spicy meatball of a wife!
Albert was said to be pale through flight sickness as a joke on the part of the writers because Brent Spiner had worn heavy white/silver makeup for over 15 years for "Star Trek: The Next Generation" and its subsequent movies.