Continuity mistake: When Diane picks up Carla and puts her on the bar stool, Carla puts her hand in her lap. The shot changes and her hands are now on the bar.
Sam Turns the Other Cheek - S3-E5
Continuity mistake: The gun that Marvin puts on the table changes position a couple of times.
Continuity mistake: Emily is sitting at the table with a beer before Norm brings her one. (00:07:10 - 00:08:00)
Visible crew/equipment: In the first shot after the opening credits a boom mic is visible. (00:02:40)
Visible crew/equipment: Right after Sam does his trick with the match, a boom mic is visible. (00:02:50)
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)
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.
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.
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)
Continuity mistake: When Carla says "And I will be your slave for the evening" she has a towel over her shoulder. When Diane goes over to talk to her it's gone.
Continuity mistake: When Diane finds out that Gino is not Sam's son, the towel that is on Coach's shoulder keeps changing position. In one shot it disappears then when the camera is facing him half is in font and half in back. When the camera is to his back most of the towel is in the back.
Continuity mistake: When Norm tells Dave he is the best sports reporter in town Dave is holding sunglasses and a paper. The shot changes and he is now only holding the paper.
Continuity mistake: When they are talking about Ed coming to the bar. Coach is drying a glass, the shot changes and he is no longer holding the glass.
Sam's Women - S1-E2
Continuity mistake: When Carla is explaining to Norm why there are drawbacks to dating beautiful women, the amount of beer in Norm's glass changes a couple of times.
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)
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)
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)
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)
Adventures in Housesitting - S7-E11
Continuity mistake: When Mr. Sheridan comes to talk to Rebecca there is a pencil on the bar, when he goes to leave it has disappeared. (00:04:45)
Adventures in Housesitting - S7-E11
Continuity mistake: Sam pours Frasier his coffee - he starts to hand it to him, the shot changes, and Frasier is instantly drinking it. (00:02:50)
Answer: They sometimes acquire episodes from syndicated reruns. The ones with the cut scenes. Sundance channel have some episodes of M.A.S.H. uncut.