Continuity mistake: Marty brings a six-pack of beer to the cabin, and puts it down on the table where it stays for the scene - but during the scene one of the cans is sticking out for a few shots, then returns to normal later. No one went near the beer during that time.
The Botched Language of Cranes - S2-E6
Continuity mistake: About halfway through the show, Daphne, Roz, Niles, Frasier and Marty are all in the living room. Roz hands Frasier a piece of paper, which he takes and starts to unfold it - in the next shot, he is taking the paper again.
Continuity mistake: Martin goes out to a baseball game with a famous writer that Frasier and Niles admire. While he is out, they read one of his books he accidentally left behind. When the author returns, he ends up holding the pages of the book in his hand, whilst standing in front of the fireplace. In one shot he is holding them in his left hand, but when the view cuts to another angle, he has them in his right hand. This occurs just before he goes outside to throw the pages off the balcony. (00:20:25)
Continuity mistake: While Marty and Daphne are watching the basketball game on TV, he says "it's completely different", the remote suddenly appears on the table beside him; it wasn't there before and wasn't in his hand. A couple of shots later, when he yells "unbelievable!" it's gone again.
Visible crew/equipment: When Daphne is yelling from the kitchen door about Marty not storing his gun properly we can see pole-shaped shadows passing over her head on the shelves behind her. These cannot be explained by the actor's movements.
And the Whimper is... - S1-E18
Continuity mistake: Early in the show, Frasier is sitting in Cafe Nervosa with Niles and Bebe, drumming on the table with the fingers of his left hand. In the next shot his hand is pulled in, lying on the table in front of him.
Hot Ticket - S6-E4
Continuity mistake: When Trevor asks Frasier and Niles about "the hat scene," you can see Frasier's hands resting on the bar away from his glass. In the next shot, his hands are clasping his glass.
The Show Where Sam Shows Up - S2-E16
Continuity mistake: At the end of the episode after Sam mentions stewardesses he claps his hands, and his seat belt (which was caught on something) moves across his chest to the regular position. Cut to a wide shot of the car and Sam's seat belt is back to the position it was in before. (00:21:05)
Hot Ticket - S6-E4
Continuity mistake: Frasier and Niles are talking about getting tickets for the play. On the table next to Marty's chair there's a newspaper that changes position noticeably during their conversation. Neither of them touched it and Martin is not in the scene.
Docu.Drama - S8-E16
Continuity mistake: When Martin is eating at the coffee table, you see the front of the tomato sauce/ketchup bottle, then the back, then the front again. Also the spice that was on the table moves without anyone touching it.
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.
To Thine Old Self Be True - S7-E20
Continuity mistake: Frasier goes to get a newspaper out of the curbside kiosk, and catches his jacket in it. He places the newspaper to his right on top of the rack beside it and the shot changes to Regan coming out of the florist behind him. Then we see the newspaper in his left hand, without having time to have picked it up.
Continuity mistake: As Roz is introduced to Clint, there is nothing on the console where Frasier is standing. But as the scene progresses, a clipboard suddenly appears there, without human assistance.
Perspectives on Christmas - S5-E9
Continuity mistake: Daphne puts a couple of Christmas bags on Marty's chair; the one facing the camera has a Santa on it and behind that are pieces of pink paper sticking up about 6 inches. The pink paper is sometimes visible, and sometimes isn't, as the scene progresses, from the same angle.
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.
Someone to Watch Over Me - S2-E19
Continuity mistake: Frasier and Roz are in his booth and Roz puts her chocolate bar on the counter. While Frasier is on the radio, we sometimes see it at his left elbow and sometimes it is not, even though the angle doesn't change. (00:02:20)
Continuity mistake: Frasier gets caught in Daphne's Room for the second time and crouches down beside her bed with the quilt over his head. He then sneaks into the bathroom - the quilt is left hanging over the edge of the bed. Shortly afterwards he runs out of the bathroom and the quilt is now folded over, completely on top of the bed, even though no one went near it. (00:13:30)
When a Man Loves Two Women - S6-E21
Continuity mistake: Daphne and Marty are arguing about Cassandra and Faye. As the shot goes from one to the other, the spout on the milk carton goes from opened to closed and back again. (00:09:35)
Continuity mistake: Martin is listening to Donny talk to Niles in his office. At one point Marty has his right hand up to his face but in the next shot his hands are laced together, resting on his stomach, with no time for a natural change. (00:09:30)
The Seal Who Came to Dinner - S6-E8
Continuity mistake: Frasier and Niles are in Cafe Nervosa talking about Niles' Dinner Party. During the scene, sometimes the lid of Niles' coffee up is on, and sometimes it is off, even though Niles never touches it. (00:02:35)
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.