Continuity mistake: Why can Lilith hear what they are saying through the door? In several other episodes, the characters have had arguments or insulted the person at the door without them being able to hear. Yet here suddenly it's possible for her to hear.
Continuity mistake: After Niles knocks the shoebox on the floor, he goes to put the banana on the table, but pulls back with it still in his hand. When he runs over to inspect the fireplace, the banana is nowhere to be seen.
Continuity mistake: Niles stumbles catching the banana and knocks the shoebox off the table and it lands on the floor. The next shot shows a long dark item lying on the carpet - it wasn't there before and didn't come off the box.
Continuity mistake: Just after Niles knocks the box on the floor, we can plainly see it through the legs of the chair. When Marty goes to pick it up, it is now out of our range, even though the camera angle remains the same.
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.
Continuity mistake: Marty picks up the head of the statue that was shot off and holds it for a couple of seconds. He then puts it down by the phone. After Daphne says, "All right, what's the plan?" we see it is in his hand again, and he puts it down again.
Continuity mistake: Marty's shoebox is sitting on the table. Niles walks by and Daphne throws him a banana from the kitchen - the camera shows the box again, and it has turned about 45 degrees.
Continuity mistake: When Lilith says Frasier can't make it for lunch, Niles grabs the back of his dad's chair with his left hand. The next shot shows his hand down by his side, without enough time for the shift.
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.