Mistakes in Frasier

Mistake #1

There was an episode in which Martin attempts to end a feud between Frasier and Niles by telling a story about his detective partner. He starts with the line, "I never had a brother...", but in the episode about Frasier's cousin Nikos getting married, Martin's brother Walt was introduced.

Mistake #2

Frasier (and later the others) come back to his apartment to avoid the rain - they shake off umbrellas, and we even hear the storm at the very start of the scene. However there's no rain on the balcony - can't be covered, as we see in "call me irresponsible" during the obligatory sex scene that when it's raining the balcony gets soaked.

Mistake #3

During the scene where Frasier and Roz are talking at her apartment, the mug that had been sitting on a tray moves off the tray and is sitting right on the table.

Mistake #4

Roz and Frasier are in Cafe Nervosa near the start of the show and her sunglasses are on the table. However, in a shot over Frasier's shoulder, they are not there anymore. They reappear in the next shot.

Mistake #5

Frasier is based on the character originally created on Cheers. In Fraiser, he lives with his father who is a retired police man. On Cheers Frasier once mentioned his father was a scientist. It's also worth noting that in one episode of Cheers John Mahoney, who was to later play Frasier's dad, turns up as a pianist. [Frasier also said on "Cheers" that his father was dead. When Ted Danson made a guest appearence on "Frasier" Frasier admitted that he had lied about his father since the two had been arguing so much.]