Continuity mistake: Frasier is at the store trying to return the purse he bought for Roz - the saleswoman puts the purse into its box but the lid remains on the counter. In the next shot Samantha speaks to Frasier and we see the lid is suddenly on the box.
Continuity mistake: At the beginning of the show, Frasier gives Roz an evening purse in a box. She puts it back in the box and as they talk we can see the edge of the box - from one shot to the next we can sometimes see the strap hanging out and sometimes not. The camera angle does not change.
Chosen answer: The turkey's stuffing.