Continuity mistake: In the back room, Norm's glass goes from nearly empty to half full and back.
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)
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)
Continuity mistake: When Rebecca and Sam are talking about the auction in one shot the beer in front of Norm disappears. (00:03:25)
Continuity mistake: Sam puts a beer in front of Norm. The shot changes and Sam repeats the action.
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)
Continuity mistake: At the beginning of the episode when Diane and Sam are talking, Sam is pouring some coffee, he starts to put the coffee pot down, the shot changes and he is no longer holding the coffee pot and has started to pick up his cup.
The Peterson Principle - S4-E18
Continuity mistake: When Norm says "you're right, guys don't tell on other guys" the cigar he is holding suddenly moves to the beer mug in front of him.
Continuity mistake: When Sam goes over to talk to the guy sitting at the table, the door opens and someone walks in, the shot changes and the person has disappeared.
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: 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: 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 Carla says "You're kidding" about the picture she has, a boom mic is visible. (00:12:20)
Feelings... Whoa, Whoa, Whoa - S11-E9
Other mistake: At the beginning of the episode when John Hill comes downstairs he says he hasn't the bar since the fire. But he was in the bar in the previous episode.
Character mistake: When Sam and Diane are embracing and saying goodbye, Diane asks, "Sam?" and Sam replies, "Yeah, Shel." Shelley is the actor's real name. (00:17:00)
Suggested correction: He says "yeah, chum?" It's another word for pal or friend, which is in line with everything else he has been saying.