Continuity: Before Daphne's wedding in season 7, Mrs. Moon thinks Daphne's pregnant. In this episode she thinks Daphne is a virgin.
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Quotes
Frasier: Roger, at Cornell University they have an incredible piece of scientific equipment known as the Tunneling Electron Microscope. Now, this microscope is so powerful that by firing electrons you can actually see images of the atom, the infinitesimally minute building blocks of our universe. Roger, if I were using that microscope right now, I still wouldn't be able to locate my interest in your problem.
Trivia
David Hyde Pierce made a guest appearance on "The Simpsons" as the brother of Kelsey Grammer's character Sideshow Bob. See more...
Frasier (1993) - 1 mistake in "Mother Load (1)"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
Mother Load (1) (season 9, episode 12)
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