Let Me Count the Ways - S1-E14
Continuity mistake: In the opening scene Diane picks up a towel that is on the bar, the shot changes she is no longer holding the towel. (00:00:25)
Let Me Count the Ways - S1-E14
Continuity mistake: When Diane turns the TV back on for everyone to watch the game, the TV appears in the background and it's off - this happens twice.
Let Me Count the Ways - S1-E14
Continuity mistake: When Coach introduces Marshall to Diane, there is a beer mug in front of Marshall, the shot changes and he is now holding the mug. The next shot the mug is on the bar, when the shot changes again he is holding the mug.
Continuity mistake: When Sam tells everyone it's closing time, he asks Harry how he got into the bar whilst he is playing snooker. He replies and then places a white snooker ball two inches behind a blue ball. There is also a yellow ball about three inches to the right of the blue ball. In the next shot, the yellow ball has suddenly moved a foot away from the blue ball. The yellow ball returns to its original position three inches away from the blue ball in the next shot. (00:00:10)
No Contest - S1-E18
Revealing mistake: The photographs and news items relating to the Boston Barmaid Contest have been clumsily pasted onto a real newspaper. The paper upon which they were printed is cleaner and whiter than the off-white newsprint and the photographs have much greater contrast.
Continuity mistake: After Diane's 'Romance is in the air' Sam comes closer to her and stands right behind her. Then there is a cut and suddenly Sam is standing to her right, shoulder to shoulder - it's a different angle, but the distance is too great. (00:03:30)
Old Flames - S2-E7
Continuity mistake: In the opening scene when Norm is talking and he says "we caught a little movie this afternoon," he starts to take a drink from his beer, the shot cuts to behind him and he is still drinking. Then the shot changes - his mug is sitting in front of him, and he starts to take a drink. (00:00:40)
Old Flames - S2-E7
Continuity mistake: After Dave walks into the bar the amount of beer in Norm's mug changes a couple of times.
Old Flames - S2-E7
Continuity mistake: When Diane walks in and asks where Sam is, there is a box on the bar. When she walks up to the bar the box has changed, then later changes back.
How Do I Love Thee, Let Me Call You Back - S2-E10
Visible crew/equipment: The shadow of a boom mic can be seen at the top of the screen when Sam comes out of the office to see who is coming with him to the fight. (00:09:10)
Continuity mistake: When Sam and Diane are talking about what they are going to have for dinner Sam opens a bottle of wine. The shot changes, the wine bottle has disappeared, and Sam is holding a couple of glasses. (00:14:15)
Visible crew/equipment: Right after Sam does his trick with the match, a boom mic is visible. (00:02:50)
Visible crew/equipment: In the first shot after the opening credits a boom mic is visible. (00:02:40)
Continuity mistake: Diane is looking at the picture Carla gave her. The shot changes and Diane is now looking straight ahead as she gives Carla the picture. (00:08:25)
Continuity mistake: When Carla is saying what happened at the wedding, Norm is about to take a drink - the shot changes and he is already drinking. (00:14:25)
Continuity mistake: When Carla says "This will be great - Nick's a bleeder" they are standing next to each other without touching. The shot changes and they each have one arm around the other.
Continuity mistake: When Coach walks out from behind the bar near the start, he's got feathers almost up to his knees. Then when he turns around to walk back, they're now only over his feet. (00:03:55)
Continuity mistake: Emily is sitting at the table with a beer before Norm brings her one. (00:07:10 - 00:08:00)
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)
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.
Answer: Here is the source of the "WE WIN" photo: http://www.oldnycphotos.com/nyny587ac.html Brooklyn, of all places.