Visible crew/equipment: When Zaphod says his first line "I certainly didn't survive.", you can see the person who plays his third arm standing behind him.
Big Brother - S1-E1
Continuity mistake: At the start of the episode when Del walks behind Grandad's chair, the way he is holding his jacket changes between shots. (00:01:15)
There's Just No Accounting... - S2-E18
Visible crew/equipment: At the end, when Carlisle claims he and Bill had a business lunch in June to discuss a case, Pam explains that La Maison Faire is very expensive French cuisine in Beverly Hills, and in the next shot an actor's T-mark is visible on the floor. (00:47:15)