Give Me a Ring Sometime - S1-E1
Visible crew/equipment: When Sumner goes to the back to make a phone call, we can see a crew member sitting on a wooden chair with a camera beside him and a few more people in the distance. (00:04:30)
Visible crew/equipment: The very first shot after the opening titles shows cars driving in front of the bar. If you look at a brown car that drives past, you can see the director sitting in the director's chair, reflected on the car. (00:03:00)
Visible crew/equipment: When Sam, Carla and Diane are in Sam's office and begin laughing Coach walks in, laughs for a few seconds, and leaves. Right after that the obvious shadow of a piece of equipment (probably a camera) passes across the floor in front of Diane. (00:22:15)
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)
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)
Visible crew/equipment: After Frasier and Diane come in with Dr. Ludlow, Frasier asks Diane to give him a hand, they go and talk over by the bar and you can see the end of the set, the wall ends and there is a curtain. (00:04:10)
If Ever I Would Leave You - S3-E20
Visible crew/equipment: A boom mic is visible after Nick goes into the office. (00:19:45)
Visible crew/equipment: When Carla says "You're kidding" about the picture she has, a boom mic is visible. (00:12:20)
Visible crew/equipment: When Norm walks in at the beginning of the episode you can see the end of the set the brick wall changes to a curtain.
Visible crew/equipment: When Cliff's father comes into the bar for the first time and is standing by the bar, the end of the set the brick wall changes to a curtain. (00:07:45)
Visible crew/equipment: At the end of the episode when Cliff is talking you can see the end of the set, the brick wall changes to a curtain. (00:23:55)
Visible crew/equipment: In the opening scene after Sam says "I think this calls for drastic measures" there is a shadow of the camera on the wall behind Norm.
Visible crew/equipment: At the beginning of the episode when Rebecca walks over to Norm, a shadow of the boom mic can be seen at the top of the bar. (00:04:25)
A Kiss is Still a Kiss - S6-E10
Visible crew/equipment: There's a boom microphone visible at the top of the screen while Sam is talking with Evan Drake. (00:06:55)
Backseat Becky, Up Front - S6-E25
Visible crew/equipment: When Rebecca goes to talk to Mr. Drake at the party you can see the top of the set and the studio lights in the upper left corner. (00:06:25)
How to Recede in Business - S7-E1
Visible crew/equipment: After Sam walks into Rebecca's office at the start a boom mic is visible. (00:00:50)
Visible crew/equipment: After deciding to decorate their own place you can see some mic equipment at the top of the screen. (00:06:30)
Visible crew/equipment: After Sheila leaves the bar, when Sam hops up onto the counter Rebecca exits the office, and just as Sam says, "Hey, let me ask you something, do you think my life is empty and void of any meaning," the moving boom mic casts a shadow on the wall, over the office door. (00:20:35)
Get Your Kicks on Route 666 - S10-E2
Visible crew/equipment: The edge of the set can be seen after Norm drives up in the golf cart. (00:22:30)
Answer: Here is the source of the "WE WIN" photo: http://www.oldnycphotos.com/nyny587ac.html Brooklyn, of all places.