What is... Cliff Clavin? - S8-E14
Continuity mistake: At the point Cliff is disputing the fact that he thought his answer was right, on the right-hand side you can see the woman player's, Agnes, score. It says $400. Then in the next shot it changes to $3300. Then in a little bit later it changes back to $400. (00:14:30)
What is... Cliff Clavin? - S8-E14
Continuity mistake: Just before they reveal the answers of Final Jeopardy, they take a wide shot, and Cliff's question (Who are 3 people who have never been in my kitchen) is already revealed. But when they take a tight shot and ask Cliff to reveal his question, it is covered up.
Continuity mistake: After Frasier leaves to be bad, Norm starts talking. He puts his hands on the bar, the shot changes and he now has one hand on his glass of beer. (00:16:55)
Continuity mistake: When Cliff walks into the bar and walks over to Norm his beer is almost gone - the shot changes and it's full. (00:17:25)
Indoor Fun With Sammy and Robby - S8-E19
Continuity mistake: After Sam and Robin are done playing darts, Sam puts his darts on the pool table. The shot changes and the darts have moved.
The Ghost and Mrs. Lebec - S8-E23
Continuity mistake: When Carla is talking about seeing Eddie and the restaurant there is someone at the bar who puts their drink down. The shot changes, the drink has disappeared from the bar, and the person puts it down again.
Continuity mistake: Sam, Norm, and Woody are helping Rebecca move into Robin Colcord's house. When a curious Norm opens a bedroom door, the wall is bare. The shot cuts to Rebecca then back to Norm, but now there is a desk with flowers and a vase on it, plus a picture hanging on the wall.
Breaking in is Hard to Do - S9-E7
Continuity mistake: Rebecca walks to the bar, busily writing her love-letter to Robin on a notepad. As she speaks with Sam, she tilts the notepad toward the camera. We can see it is blank.
Continuity mistake: When Sam puts the paper from John on the bar it is next to a bowl, the next time we see it there is now more space between the bowl and the paper. Part of the paper is in the air, then the next shot when Sam picks up the paper it is lying flat on the bar.
Continuity mistake: In the scene where Sam talks to Henri, we can see Sam wearing a wedding ring. Of course, in the show, as a great lady's man, Sam is not married. (From 6:39 to 7:57).
Continuity mistake: The second time Frasier and Lilith come into the bar Sam is putting ice in glasses for them. Sam finishes the second one and puts it on the bar. The shot changes he is still putting ice in the second glass.
Get Your Kicks on Route 666 - S10-E2
Continuity mistake: When Frasier is sitting at the bar talking about the trip he is going to take, Cliff walks over and sits down. There is a beer sitting in front of him - he pushes it forward and Sam moves it. The shot changes and the beer is back where Cliff had first moved it, and he is holding his own beer. For the rest of the scene his beer keeps appearing and disappearing while the other one keeps changing position.
Continuity mistake: In the scene where Carla is sitting at a table in the bar, dressed as the new Madame LaCarla and is voicing her doubts about being the new Madame, you can see that Carla is only wearing one earring, the left. In other scenes she is wearing both.
The Norm Who Came in from the Cold - S10-E4
Continuity mistake: Carla tosses Rebecca an egg she is supposed to take care of, like a baby, for a $5 wager. The egg bounces off Rebecca's hands and over the bar onto the floor. In the next scene, Lilith and Frasier are walking into the bar and the egg was shown as being smashed on the bar itself. The next cutaway, with Lilith walking by the same spot, has no egg on the bar anymore. (00:03:40)
Where Have All the Floorboards Gone? - S10-E8
Continuity mistake: After Kevin leaves the blueprints on the bar go from unrolled to rolled up a couple of times between shots.
Where Have All the Floorboards Gone? - S10-E8
Continuity mistake: In the opening scene when Frasier's car alarm keeps going off two people are walking behind him heading to cheers. In the close up of Frasier they are not there.
Continuity mistake: When Woody is showing Sam what he bought at the drug store a mask appears on the bar, but Woody was not shown taking it out of the bag. (00:01:00)
One for the Road (1) - S11-E26
Continuity mistake: After Don leaves the bar, a few minutes later Frasier shouts at him, "Run, Don! Run like the wind!" and Rebecca is left sitting alone at the table crying, but when it cuts to the overhead shot of the bar we see Don is still sitting at the table, even though he left five minutes earlier. (00:07:05 - 00:08:15)
Answer: Here is the source of the "WE WIN" photo: http://www.oldnycphotos.com/nyny587ac.html Brooklyn, of all places.