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)
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.