Diana Ross - S4-E23
Continuity mistake: When Diana Ross finishes her first song, the bird has both his feet on the ground; in the next shot, the bird has one leg raised, without enough time passing to do so. (00:08:45)
Mark Hamill - S4-E16
Revealing mistake: When Luke Skywalker is introducing his 'cousin' Mark Hamill at the end, you can tell it's a split screen by the fact that Luke looks right past him, even once he's on stage. (00:25:10)
Visible crew/equipment: When the group of pigs, chickens and frogs are singing "Temptation," the head of Dave Goolez (the guy who does Gonzo) is visible under the second chicken on the right several times during the sketch.
Visible crew/equipment: Several times during "Love Ya To Death", you can see Jim Henson's head popping up from under Dr. Teeth.
Audio problem: In the ballroom sketch when Janice is talking to Zoot, her mouth starts moving before we hear her even say anything.
Revealing mistake: When Leo Sayer is in the tree singing you can the wire on his back supporting him.
Elton John - S2-E14
Visible crew/equipment: Towards the end of the "Crocodile Rock" song, right before Elton John falls into the water, one of the singing crocodiles jumps up towards him and you can see where the puppet ends, revealing the puppeteer's black arm sleeve. Also, a few seconds later during the final shot of the sequence, for the first second or so you can see a puppeteer's head next to the same crocodile described above. (00:04:15)
Judy Collins - S2-E5
Visible crew/equipment: While Link Hogthrob is singing, "I Talk to the Trees", you can see a puppeteer's head briefly during the song. (00:12:05)
Judy Collins - S2-E5
Visible crew/equipment: Right after J.P. Gross says, "What for? No money in hog calling!", you can see a puppeteer's head to his left. (00:11:45)
Zero Mostel - S2-E2
Visible crew/equipment: When Zero Mostel is dispelling the monsters, you can see a puppeteer's head to his right for a brief moment before it disappears. (00:20:00)
Zero Mostel - S2-E2
Visible crew/equipment: As Animal hits the cymbals, the top of a puppeteer's head pops up for a split second next to the drum. (00:22:45)
Visible crew/equipment: During "Veterinarian's Hospital" when Dr. Rowlf says, "Day in and day out, it's the same 'ol routine!" you can see a puppeteer's head behind him.
