Visible crew/equipment: When Carla is having her vision about Cliff the camera goes to a wide shot - at the top of screen you can see the shadow of a boom mic.
Visible crew/equipment: During the intro scene as Carla walks behind the bar, a crew member in a red shirt is visible standing to the left of the front window. (00:00:20)
Where Have All the Floorboards Gone? - S10-E8
Visible crew/equipment: In the opening scene when Frasier gets out of his car the camera is reflected in his car window.
Visible crew/equipment: At the end, Sam gives up trying to get the phone number of the woman at the table. As Sam walks back to the bar, Cheers director James Burrows can be seen directing an off-screen camera. He is the bearded man wearing the green shirt.
Teaching with the Enemy (1) - S11-E6
Visible crew/equipment: The studio lights are visible when Frasier is done with his scotch and says "one more, Woody."
The Girl in the Plastic Bubble (2) - S11-E7
Visible crew/equipment: After Frasier comes out of Sam's office and goes to sit at a table the studio lights and boom mic are visible. (00:13:15)
The Girl in the Plastic Bubble (2) - S11-E7
Visible crew/equipment: When Norm leaves the bar after seeing Frasier on TV the edge of the set can be seen. The brick wall ends and there is a curtain.
One for the Road (1) - S11-E26
Visible crew/equipment: When Rebecca leaves Don at the table to relax while she gets champagne to "celebrate the answer", it cuts to an overhead shot as we hear the TV host introduce Salman Rushdie and Dr. Ruth, and the set lighting can be seen as well as the boom and mic moving around at the top of the screen. A few minutes later the mic can be seen bobbing again in the overhead shot from the same angle. (00:03:20 - 00:08:20)
Answer: Here is the source of the "WE WIN" photo: http://www.oldnycphotos.com/nyny587ac.html Brooklyn, of all places.