Rebound (1) - S3-E1
Continuity mistake: When everyone is talking to Sam about his drinking, there is a empty beer mug in front of Norm when he says "Maybe you are drinking more than you should." The shot changes and his mug is now about half full.
Rebound (1) - S3-E1
Continuity mistake: When confronting coach about Diane coming to the bar, Ted Danson's wedding ring is visible on Sam's left hand. Later in the scene it disappears. (00:15:17 - 00:16:00)
Continuity mistake: When Diane picks up Carla and puts her on the bar stool, Carla puts her hand in her lap. The shot changes and her hands are now on the bar.
Sam Turns the Other Cheek - S3-E5
Continuity mistake: The gun that Marvin puts on the table changes position a couple of times.
Continuity mistake: When Frasier and Diane are telling Sam they are moving in together, there is a napkin in front of Frasier that suddenly moves when Sam says "Really that was one of my highlights."
Continuity mistake: When Frasier and Sam are talking in Sam's office, Sam sits down in his chair and leans back, the shot changes and he leans back again. (00:07:15)
Behind Every Great Man - S3-E19
Continuity mistake: When Paula first comes into the bar the amount of beer in Norm's mug keeps changing.
The Mail Goes to Jail - S3-E17
Continuity mistake: The first time Sam leans down when Diane is stuck in the vent, in the closeup shots of Diane, Sam's glove is missing from his hand on the floor.
The Heart is a Lonely Snipe Hunter - S3-E14
Continuity mistake: When the guys get back from snipe hunting Norm puts his hat on the bar. The hat changes position a few times throughout the scene.
The Heart is a Lonely Snipe Hunter - S3-E14
Continuity mistake: When the guys are getting ready to leave for fishing and Diane is trying to get them to take Frasier, there is a carton of half and half on the bar. At one point Diane is seen taking it and holding it, but a couple of shots later the carton is now back where it was.
Answer: Here is the source of the "WE WIN" photo: http://www.oldnycphotos.com/nyny587ac.html Brooklyn, of all places.