Cheers (1982)
0 questions in season 4
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Revealing mistake: When Frasier comes into the chalet after skiing he doesn't show any of the visible effects after a hard day on the slopes. Meaning, his face isn't even flushed from the cold, his hair is perfectly combed after wearing a hat and there is not even a drop of snow on his boots.
One for the Road (3) - S11-E28
Trivia: The last line ever in this series was, "Sorry, we're closed."