Nikolai

Homer the Heretic - S4-E3

Revealing mistake: When Lisa says "Truly this was an act of God", her ear disappears and reappears several times. (00:19:30)

Nikolai

Prick Up Your Ears - S5-E6

Revealing mistake: As Stewie is walking toward Herbert's house, he just suddenly appears mid-screen.

Nikolai

Hell Comes to Quahog - S5-E3

Revealing mistake: Right after the "Ghost Whisperer" cutaway, while Peter, Chris, and Lois are sitting on the couch, Chris' eyes disappear for a single frame.

Nikolai

I Take Thee Quagmire - S4-E21

Revealing mistake: When Peter leans down to get the basketball, a dot briefly appears on his shorts, then disappears almost immediately.

Nikolai

Lethal Weapons - S3-E7

Revealing mistake: When Peter says "kicking, Lois?", after being kicked into the stereo, his nose very briefly turns white. (00:20:00)

Nikolai

A Picture Is Worth 1,000 Bucks - S2-E11

Revealing mistake: When the hotel employee gives Peter the key to the room, the man's moustache turns yellow for a second.

Nikolai

Brian the Bachelor - S4-E7

Revealing mistake: When Brian tells Brooke "I understand", after he thought he was being rejected, his left ear disappears for a single frame.

Nikolai

Lethal Weapons - S3-E7

Revealing mistake: When Peter runs across the dock after getting out of the boat, a large chunk of his body is missing.

Nikolai

E-I-E-I-(Annoyed Grunt) - S11-E5

Revealing mistake: After Lisa says "For a product that's evil and deadly" while standing in front of the tomacco stand, there's a duplicate Lisa behind her that stands still while she moves, giving Lisa the appearance of having two heads. It looks like the animators made a mistake while trying to animate Lisa.

Nikolai

The War of the Simpsons - S2-E20

Revealing mistake: When Ned says "Crème de cassis" while describing what was in the drink he made. There are several animation errors in this shot. His head is disconnected from his body, and his nose disappears. Also, a part of his face is missing between his fingers while he does the 'OK' hand gesture.

Nikolai

Politically Inept, with Homer Simpson - S23-E10

Revealing mistake: Right before Homer is patted down at the airport, his facial hair briefly flickers yellow.

Nikolai

Politically Inept, with Homer Simpson - S23-E10

Revealing mistake: While Homer catches his underwear with his tongue after the Simpsons' clothes burst out of the suitcases, Homer's tongue briefly passes through his underwear.

Nikolai

Moe Letter Blues - S21-E21

Revealing mistake: When Homer is riding Barney like a bull at Moe's, there are duplicates of Sam and Larry (the barflies) in the same shot.

Nikolai

Saturday Morning Fun Pit - S7-E19

Revealing mistake: Near the end of the "Bendee-Boo" segment, while everyone is laughing, one of the Harlem Globetrotters' (between Amy and Leela) right arm keeps disappearing and reappearing several times in one shot.

Nikolai

Dangerous Curves - S20-E5

Revealing mistake: When Alberto says "If you had completed your seduction of me, I never would have met Sylvia," his shirt collar briefly turns into the same color as his blazer.

Nikolai

Little Girl in the Big Ten - S13-E20

Revealing mistake: When Bart says "I don't feel so good" after being bitten by a mosquito, his lower body under the table is not visible.

Nikolai

Lisa the Tree Hugger - S12-E4

Revealing mistake: When Lisa wraps herself in Marge's arms right before she falls asleep, the inside of her mouth turns yellow.

Nikolai

Homer to the Max - S10-E13

Revealing mistake: There are two Ruth Powers in the same shot, when the people are crowding on Homer at the mall.

Nikolai

Wild Barts Can't Be Broken - S10-E11

Revealing mistake: Lenny's lower torso disappears for two frames when he, Carl, Homer and Barney are singing "We Are The Champions/We Will Rock You."

Nikolai

Road to Rhode Island - S2-E13

Revealing mistake: When Brian says "Our tickets were in the bags", half of his left hand is missing for a frame.

Nikolai