They're Tearing Down Tim Riley's Bar - S1-E17
Continuity mistake: When William Windom comes into his office, we see a stone wall in the background, with a wall clock, a painting and a credenza, but when Bert Convy comes in through the same door later, the background is completely different. And again, when William Windom leaves his office after he's been fired, the background has changed again. (00:03:30 - 00:07:10)
Last Rites for a Dead Druid - S2-E52
Visible crew/equipment: After Jenny and Mildred find the statue Jenny calls for Mr. Bernstein, and when Mr. Bernstein walks into the room the white tape T-mark can be seen on the rug where he stands.