To Kill a Talking Bird - S4-E14
Visible crew/equipment: After Frasier starts the fireplace and it scares Niles' bird, you can see the hands of a bird handler by the stairs on the upper right of the screen. (00:12:21)
Goodnight, Seattle (2) - S11-E24
Continuity mistake: When Eddie eats the wedding ring at Martin's wedding, there's no food on his plate, next shot there is.
Continuity mistake: After Martin lowers his chair and gets the bag of pretzels it cuts back to Frasier and you can see the bag still on the coffee table. Then it cuts back to Martin and he has the bag. (00:06:16)
Revealing mistake: It's clear the "Manchester" pub scene was filmed in the United States, as the pint glasses used are American pints and not imperial pints as used in the UK, which are approximately 20% bigger.
Continuity mistake: When Frasier is asking Noel for a favor, Frasier sets papers down on the desk which move from place to place and even disappear and then reappear between camera shots.
The First Temptation of Daphne - S9-E3
Revealing mistake: Frasier and Martin are arguing in the kitchen about the cricket. Martin opens the fridge to grab a beer and slightly bumps the fixed island in the kitchen, which moves.
Revealing mistake: After Donny puts the phone onto speaker you can see him deliberately wiping the mustard from the sandwich across his left cheek to prepare for the gag at the end of the scene. (00:06:45)
Morning Becomes Entertainment - S7-E19
Continuity mistake: Bebe places her purse behind the couch when she sits down to start the show. It appears and disappears throughout her scene with Frasier.
Roz, a Loan - S6-E9
Continuity mistake: The bag of beauty products changes, one with a logo and one without.
The Botched Language of Cranes - S2-E6
Plot hole: Several times throughout the show, it's bought up that there is a seven second delay on Frasier's show at KACL, which, among other things, would allow Roz to "dump" the last seven seconds of what's been said and prevent it from being broadcast. When Roz notices that Frasier is still on the air during his rant, it takes her about nine seconds to get back to her console, so she should have been able dump the last seven seconds of his rant, leaving only the first few words of Frasier's rant (likely no more than "Good Grief, have you...") going to air, which would be much less awkward compared to his entire rant. (00:09:20 - 00:09:50)
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.