Continuity mistake: When Lilith and Frasier are at Dr. Campbell's (the first time), he makes them tea. A shot shows him preparing it, pouring it, etc. But in the next shot, Frasier and Lilith are already holding their cups. There was not enough time for him to have passed them the cups.
Continuity mistake: Frederick appears in the kitchen to talk to his parents, who are ignoring him. In one shot he is covered with spots and in the next, he only has about half as many. He is supposed to have hives, which I know can appear and disappear quickly, but these look nothing like hives in the first place.
Our Father Whose Art Ain't Heaven - S4-E8
Continuity mistake: Martin and Frasier are in the restaurant and Marty says "you're eating light" as Frasier has his menu up at chest level. The next shot, without enough time for change, shows the menu lowered several inches and held at a different angle.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: When Sherry brings in the bottle of wine, it's in a paper bag which is twisted around the bottle when she puts it on the coffee table. The next shot shows the bag has been loosened around the bottle and is quite wrinkled. No one touched it in that short time.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: When Sherry first meets Frasier and Niles, she puts her coat down towards the center of the couch. A few shots later, although no one has moved it, it shifts to the left and her purse, which wasn't visible before, can be seen.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: In Frasier's apartment, Sherry has just been introduced. Marty has a glass of wine down on the dining room table, next to another one. In the next shot the glass has shifted considerably, but the camera angle has remained the same.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: Frasier tells his father Maureen wants to break up with him, and Marty heads for the kitchen, leaving his blue container of stomach medicine on the credenza. But as Marty passes by the dining room table, he suddenly has the container in his hand again.
Dad Loves Sherry, the Boys Just Whine - S4-E9
Continuity mistake: When Sherry tells the boys she's a sleepwalker, she has her bag slung over her right shoulder. In the next shot, without time for change, she is holding the bag in her left hand.
Liar! Liar! - S4-E10
Continuity mistake: At the beginning of the show, the KCAL gang are in Frasier's apt. celebrating the SeaBee awards. Bulldog is gloating about his win. At one point he has his left hand out in front of him and up in the air - the next shot the same hand is behind his back.
Liar! Liar! - S4-E10
Continuity mistake: At the beginning of the show, we see Marty add some beer to his champagne glass until it's almost full - just then Bulldog grabs his SeaBee award from the coffee table and now Martin's glass is almost empty, even though he's had no chance to even take a drink.
Three Days of the Condo - S4-E11
Continuity mistake: Frasier and Daphne are talking about the condo board lady leaving pink slips for Marty. There is a pink slip on the credenza which moves several inches towards the couch without either of them moving it.
Continuity mistake: While Marty is reading Daphne's novel to her, his beer can moves from one side of his table to the other, without him touching it.
Continuity mistake: Just after Daphne and Marty leave Frasier's booth, Roz picks up the clipboard from the console to Frasier's right and puts it out of sight; when the doctor comes into the booth the clipboard is suddenly on the console again.
Continuity mistake: Daphne and Martin are at KACL with Roz and Frasier, talking about flu shots. Then Marty starts talking about McGinty's and suddenly there is a clipboard on the console that wasn't there before, and wasn't put there during their conversation.
Continuity mistake: When Niles, Frasier, and Roz are in Cafe Nervosa arguing about getting a table, Roz's purse switches from her right shoulder to her left shoulder, even though she did not move it.
To Kill a Talking Bird - S4-E14
Continuity mistake: At the beginning of the show the spoon in the custard dish on Martin's table shifts from side to the other from shot to shot.
To Kill a Talking Bird - S4-E14
Continuity mistake: Niles has his dog over at Frasier's. He sits down on the couch and the dog is facing the door. The next shows the dog standing about two feet away and facing the balcony - and the third shot shows her back in the first position. There was no time for her to change positions naturally.
Roz's Krantz & Gouldenstein are Dead - S4-E15
Continuity mistake: Frasier is on the couch talking to Niles. As he says "I simply release my humble words", his hand switches from being around the middle of his bottle of water to being around the neck, with no time for natural change.
Continuity mistake: Frasier and Niles are sitting at the dining room table looking at old photos. Niles pours a cup of coffee, adds cream, and reaches for a spoon. In the next shot we see him reach for a spoon again.
Roz's Turn - S4-E17
Continuity mistake: When Roz and Frasier are in Bebe's office, and Frasier is exclaiming about her taking digitalis, the water glass in front of her is empty. The rest of the shots show it being about half full, even though she never refilled it, and there was no water source to be seen.
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.