Continuity: 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.

Continuity: 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.

Continuity: 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 appearance on Frasier, Frasier admitted that he had lied about his father since the two had been arguing so much.

Continuity: When Frasier and Niles are eating the steaks at the restaurant that Martin brought them to, in some shots you can see Frasier's baked potato, and in others from the same angle it is not visible.

Revealing: The view from Frasier's apartment shows the Space Needle prominently in the background, however, the elevator that takes visitors from the ground to the observation deck is frozen in time midway to the top. This was corrected after the first season.

Continuity: 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.

Continuity: 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.

Plot hole: Why can Niles hear what Frasier has said when he is inside the sensory deprivation tank? The whole point of these are that you cannot hear anything happening outside, so Frasier's ranting shouldn't have been heard inside. Similarly, why did the writers even have this scene with Frasier trying to talk to "Maris" when she was supposed to be inside it? Clearly they didn't quite know how soundproof they are.

Visible crew/equipment: Frasier is on the phone at KACL and the caller says "hello" - we can see a reflection moving in the glass, someone walking, between Frasier and Roz. There is no guest on the radio show, and no reference to anyone in the booth.

Continuity: During the opening credits, Frasier is playing the piano and Martin is going through papers on the table. When Marty says "I don't know, Eddie, must you?" there is something pink lying on the table. The shot goes back to Eddie and then back to the table, but the pink item has disappeared.

Continuity: Frasier and Niles are talking to Marty about the spa. As they speak, the magazines on the coffee table shift about 6 inches even though neither of them touch them.

Continuity: When we first see Daphne's wrist brace it is on her right arm. In the end credits its now on her left arm.

Other: This is for the episode "Crock Tales" (the 22nd of the season). Almost all the flashback sequences are wrong in time. The one from 2003 has Niles and Daphne coming back from their honeymoon but they married in 2002. Although not ever couple take their honeymoon directly after they've married, the wedding episode "Ring Cycle" mentions them going on their honeymoon.

Continuity: Towards the end of the show, Frasier is explaining to Niles how he was stood up that evening; at the same time he is getting himself a glass of sherry. Niles says, "there was no emergency", we see Frasier repeat the actions to get a glass of sherry all over again.

Continuity: Near the start of the show Marty brings two green mugs over to Daphne at Cafe Nervosa, gives her one and keeps one for himself. We see his hand on the mug but in the next shot the same hand is on his knee.

Continuity: When Frasier and Martin are looking at Frank examining the bowl, the cards on the table change position.

Continuity: When Frasier and Martin are yelling at each other about the mess on the carpet, Marty is holding a red plastic oil container. In one shot there is a noticeable dribble of oil on it, but in the shots before and after, it is clean.

Continuity: Niles runs to Daphne's room with a full glass of sherry. He jumps into and out of the room and suddenly the glass is empty, even though he never drank from it, and it wasn't spilled.

Continuity: Marty is patting Niles on the shoulder, comforting him over the destroyed flour child. The next shot shows him patting him on the back near his collar, with no time for the change in position.

Continuity: Just after Daphne moves the urn from the table to the bookcase, the brown files on the table change position between shots.