Continuity: During the opening credits Daphne gives Martin the newspaper and he puts his magazine on his little table. As they talk about her photo in the paper, the magazine disappears.
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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
Niles and Daphne's baby, David, was named in memory of show producer David Angell, who was killed in a plane during the September 11th attacks. See more...
Frasier (1993) - 4 mistakes in "Hot Ticket"
starring David Hyde Pierce, Jane Leeves, John Mahoney, Kelsey Grammer, Peri Gilpin (add more)
Updates: 
Series 10
Hot Ticket (season 6, episode 4)
Continuity: When Trevor asks Frasier and Niles about "the hat scene," you can see Frasier's hands resting on the bar away from his glass. In the next shot, his hands are clasping his glass.
Continuity: After Sir Trevor leaves the bar and heads for his reception, the level in the drink he left behind goes up even though no one went near it.
Continuity: Frasier and Niles are talking about getting tickets for the play. On the table next to Marty's chair there's a newspaper that changes position noticeably during their conversation. Neither of them touched it and Martin is not in the scene.
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