Continuity mistake: While Frasier is driving, Marty has the map on his lap. During this scene the map changes appearance and size from shot to shot even though Marty never opens it up.
Continuity mistake: 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 mistake: As Frasier and Niles are starting work on their book, Marty gets four snacks and a beer and sits down in his chair. He gets up and we see the two bags that were behind the beer and can of something are now in front of them. Marty never touched them during that time.
Frasier Crane's Day Off - S1-E23
Continuity mistake: Martin and Frasier are having breakfast and Marty is making fun of Frasier's radio audience. In one shot Marty's arms are folding on the table in front of him over his newspaper - in the next shot one arm is stretched out over the newspaper and the other is at 45 degrees angle in front of him.
Continuity mistake: While Frasier and Niles are having coffee outside at Cafe Nervosa, a red napkin is by Frasier's cuff. In the next shot it is suddenly in the center of the table, even though no one touched it.
Slow Tango in South Seattle - S2-E1
Continuity mistake: Towards the end of the episode, when Clarice is heading out on her date, her arms go from in front of her clasping her bag, to by her side in an instant between shots.
Slow Tango in South Seattle - S2-E1
Other mistake: When Frasier is complaining that he is not mentioned in the acknowledgments of the novel, he picks up the book and then slams it down on the desk. It sits face up, near the front of the desk. In the next shot of the desk, we see that the book is face down and has moved back.
The Unkindest Cut of All - S2-E2
Continuity mistake: In the opening scene, Frasier is leaning against the bookcase. There is a shot of Daphne, and after her one line the doorbell rings. The shot then cuts to Frasier who is instantly at the door, although he has not had time to get there.
The Unkindest Cut of All - S2-E2
Continuity mistake: While waiting at the vet's office the first time, Eddie's tongue goes in or out of his mouth depending on the angle several times.
Continuity mistake: Tom is sitting on Frasier's couch and has one hand on the arm of the couch and one on his knee. In the next shot he has both hands in front of him. (00:12:15)
Continuity mistake: Near the beginning of the show, Daphne is having a smoke, and Frasier takes it from her - her hand is on her knee but when the shot changes it is in her lap.
Continuity mistake: Niles goes to Frasier's apartment and meets Tom, the new station manager. Niles is talking to him with his hands clasped in front of him but in the next shot his hand are clasped behind his back.
Flour Child - S2-E4
Continuity mistake: Arleen the cab driver is in labour. She pushes her hair back with her hand in one shot, but in the next it is back on the steering wheel, without enough time for this to happen in real time. (00:05:50)
Flour Child - S2-E4
Continuity mistake: Frasier and Daphne are forging signatures on the get well card. In one shot they both have their pens quite a distance from the card but in the next shot they are both writing, without enough time for the change. (00:16:35)
Flour Child - S2-E4
Continuity mistake: 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. (00:18:00)
Flour Child - S2-E4
Continuity mistake: Niles is holding baby Nathan in the hospital and Arleen takes him back because he's crying - suddenly the blanket is up around his head even though it was hanging loose before. (00:21:45)
Flour Child - S2-E4
Continuity mistake: When Frasier and Daphne are copying the names into the new get well card, we see Daphne using a pen with an orange lid. She puts the lid on the pen and sets it down. In the very next shot she is writing with the same pen.
Flour Child - S2-E4
Continuity mistake: Near the beginning of the show, Roz takes a large get well card into Frasier's booth - she has some papers as well, which are on top of the card. She lowers the card and the next shot shows the papers are under the card, with no time for changes in position.
Flour Child - S2-E4
Continuity mistake: Daphne asks Frasier about his son's birth and he says that he held Frederick for the first time while Lilith was screaming at him that he would never be allowed to touch her again. But in Cheers, in the episode "The Stork Brings A Crane", we learn that A) Frasier was not present when Frederick was born and B) When he finally got to see his son for the first time, Lilith was not angry with him.
Duke's, We Hardly Knew You - S2-E5
Continuity mistake: Near the end of the show, when Niles, Frasier, and Martin are at Duke's, Niles says, "I'm not here just for you, Dad" and he puts his hand on Marty's shoulder. The next shot shows him standing about two feet away, with his hands by his side. (00:21:20)
Answer: In the last episode, they explained that Tossed Salad and Scrambled Eggs is a metaphor for the mixed-up people to whom Frasier dispenses his radio psychiatric advice.