Like with The Muppet Show, producers, directors and performers tried to make sure that the puppet characters of Muppets Tonight were presented as living objects. However, the occasional goof would appear, like those below.
In the opening moment where Clifford begins to sing, the man performing Quongo can be spotted beneath him.
The arm sleeve for the performer of Lew Zealand can be seen as he follows Clifford down the halls. In the same shot, the head of his puppeteer pops up.
A puppeteer's head is briefly visible below the straw-nosed creature.
When Gonzo rubs the laser cannon during rehearsal for "Bats", Dave Goelz's head is visible.
During the Muppet Bandstand sketch, the top of Frank Oz's head is seen covered with a blue cap. A few seconds later, Miss Piggy's arm sock is briefly visible.
Several puppeteers' heads are clearly visible under the chickens at the end of the "Bats" number. They, as well as the chickens' arm sleeves are also visible during the goodnights along with the top of Kevin Clash's head.
During the introduction to Muppet Hoo Ha where Zippity Zap helps Clifford in the introduction, a puppeteer's hand can be seen assisting in moving the sign displaying Prince Logo sign.
During the opening scene, one of the background Whatnots can be seen watching Paula and Clifford. If you look closely, you can see part of the arm of his puppeteer.
Dave Goelz's head is briefly visible as Gonzo fires the cannons.
Kermit arm-sleve is seen at various times on the episode.
When Johnny leaves the room during the cold opening, Jerry Nelson's head is visible under Johnny Fiama's Ma as Zippity Zap's Mom follows her around the room.
Just before Ma whacks Sal, the very top of a puppeteer's head (most likely Brian Henson's) is visible between Sal and Ma. Seconds later, a puppeteer's hand is visible when Ma whacks Johnny. Finally, when Ma chases Sal and the Hannah sisters away, she's holding the frying pan in her left hand, but in the next shot, it's in her right hand.
During "The Eagle's Nest," the top of Frank Oz's head is visible.