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.
Don't Mess Around With Jim - S2-E3
Visible crew/equipment: After Ralph and his students talk about Beck's will being missing the class bell rings. When Ralph says, "Tony, you got a minute," just as he walks over to Tony the microphone pops up into view at the bottom of the screen, and it continues to be seen during their conversation. (00:05:30)