Best comedy TV revealing mistakes of all time

Assaulted Nuts - S2-E3

Revealing mistake: When Carrie phones Doug at IPS, Doug goes to press the button on the phone for the correct line, but doesn't press any and continues to talk to Carrie. (00:07:40)

A Demon

The One With Rachel's Date - S8-E5

Revealing mistake: In the scene in the coffee house, Phoebe is talking to Monica who is drinking a cup of coffee. Towards the end of the scene, the camera is on Phoebe who is smiling & laughing at Monica. In the right hand corner is a side view of 'Monica' however, it is not Courtney Cox in the scene, but a completely different actress. [Widescreen version only, although the "wrong" nose is visible in the original]. (00:06:20)

Taylors in Hollywood - S6-E8

Revealing mistake: While Andy, Aunt Bee, and Opie are at the Hollywood studio watching a scene being filmed, when Andy mistakenly stands up and interrupts the filming we can see the wall and shelves behind the director, and it should look familiar because it's the wall and shelves from Floyd's shop in Mayberry.

Super Grover

Shoes, Hats, Pickle Jar Lids - S5-E9

Revealing mistake: When Charlie is in the Ferrari, his gets a call from Teddy. When Charlie brings the iPhone to his ear and talks to Teddy, you can see that the iPhone is upside down showing that no one actually called his phone.

The Treaty - S4-E7

Revealing mistake: Tom is talking on the phone in Ron's office. When he turns the phone at an angle the call home screen that has the end button, the speaker button, etc. turns to its side, which means it was a picture - he wasn't actually calling anyone. (00:02:25)

The Simpsons Christmas Special: Simpsons Roasting on an Open Fire - S1-E1

Revealing mistake: After Homer brings Santa's Little Helper home, Homer and Marge hug, and if you look behind them, the background is upside down. There is a picture hanging upside down, and there is a lamp which seems to be hanging from the ceiling. Then in the next shot, the background is normal. (00:21:40)

Hamster

The Barbarian Sublimation - S2-E3

Revealing mistake: When Sheldon gets the sword for Penny in the game, Penny walks out and you can see the laptop isn't switched on. (00:07:55)

A Demon

Gourmet Night (a.k.a. Gourmet's Paradise) - S1-E5

Revealing mistake: When the Colonel first meets Basil, the same shot is used twice of the Colonel twitching.

Ice Station Winslow - S2-E14

Revealing mistake: Carl, Eddie, and Steve are out ice fishing. At one point Carl falls through the "ice" and you can clearly see that the "ice" is made of some sort of styrofoam. It looks like the stuff used for packaging. The snow looks just as fake.

Bully for Ben - S9-E1

Revealing mistake: S9 E1 "Bully For Ben": When Ben hits the punch bag sideways, it's easy to tell that someone is controlling the punch bag as it never slows down.

A Demon

The Long Legs of the Law - S2-E1

Revealing mistake: At the very beginning of the episode, Leonard Pearce is waiting for the cue for his character to start looking for his teeth. He's standing in the living room, between his room and Del and Rodney's room. (00:00:25)

Not Normal/Gone - S6-E4

Revealing mistake: In "Not Normal" when SpongeBob says "Hmm. This video tape should help," his left arm is missing. (00:01:25)

Mr. Monk Goes to a Fashion Show - S4-E10

Revealing mistake: The fan letter Monk wrote to shirt Inspector 8, shown in close-up where it hangs on her work station wall, consists of the same paragraph printed out twice. (00:06:45)

You Better Watch Out - S2-E13

Revealing mistake: When the mall Santa lands in the Bundys' back yard, everybody looks toward the back, and when Al looks forward, he cracks a smile although he's upset about the matter. Ed O'Neil admitted he couldn't contain his laughter.

The Way We Almost Weren't - S2-E23

Revealing mistake: Closer to the end of the episode, when Lilly and Oliver are lying on the floor glued to the chairs, you can easily see black strips on their backs attaching them to the chairs.

Rose's Big Adventure - S3-E22

Revealing mistake: In this episode Dorothy and Blanche are awakened by a stench coming from the kitchen. After they go to inspect, we see that Rose is making some sort of Krispies treat. As you see her carry the plate to offer Dorothy and Blanch one, you can see that the plate is empty. And once they all start to eat them you can easily see that none of them are actually picking anything up and putting in their mouths.

Double, Double, Toil and Trouble - S4-E4

Revealing mistake: As Serena gets hit by the pie her real blonde hair shows underneath, also, she wear minimal make-up for the only time.

Roz in the Doghouse - S2-E12

Revealing mistake: About 1/3 through the episode, they are in Roz's apartment. If you watch when people enter or leave the apartment, the door has a handle lockset. It also has a lock cylinder about 1 1/2 feet above it on both sides of the door. The problem is, the side of the door has no drill hole where the latch assembly should be: it's just solid wood. The lock isn't attached to anything that would enable it to work.

Bad Blood - S2-E6

Revealing mistake: When Victor is opening the padlock, sparks fly around in close ups. In the wide angle shots there are no sparks at all.

The Naked Truth - S7-E2

Revealing mistake: While showing the clip of Marshall streaking the first time, you can see thumbnails for videos of him streaking in New York. Those videos were created later that day and could not already be posted. One also shows a woman in yellow and appears to be a retake of the scene. (00:06:15)