Friends (1994)

The One With Chandler's Dad - S7-E22

Revealing mistake: In the shot of the highway with Ross and Rachel in the Porsche before the police officer walks to them, it is very obvious that the people inside the car are not actually them.

The One With Monica and Chandler's Wedding, Part 2 - S7-E24

Revealing mistake: At the point in the ceremony where Joey forgets the rings, the camera pans out and you see Chandler step sidewards to get the ring from Ross, and Monica step sidewards to get the ring from Rachel and Phoebe. As Monica moves, her dress slides across and one of her feet is revealed; it has what looks like a brown boot or heavy brown shoe on it. (00:20:05)

The One With The Engagement Picture - S7-E5

Revealing mistake: In the shot of the paper with the picture of Monica and Joey, the anouncement written there starts out fine, but near the end the middle part is just repeated again. (00:20:35)

The One Where They're Up All Night - S7-E12

Revealing mistake: Just after Ross realises that he and Joey are locked out on the roof, he goes over to the door and tries the handle with some force. That whole part of the set moves - door and walls. (00:03:25)

STP ★

The One With Chandler's Dad - S7-E22

Revealing mistake: When we first see the Porsche, there are smear marks on the bonnet from previous takes of Ross diving across it. (00:04:35)

Jon Sandys ★

The One With Chandler's Dad - S7-E22

Revealing mistake: The number (licence) plate on the Porsche changes between the time it is outside the coffee shop (YSO 791) and the time Rachel and Ross are driving on the highway (JGL 334). (00:04:35 - 00:13:00)

tw_stuart

The One With All The Candy - S7-E9

Revealing mistake: At the start of the episode, when Ross says, "No, one daddy, two mommies," Ben is mouthing the line along with him. (00:00:15)

The One Where Chandler Doesn't Like Dogs - S7-E8

Revealing mistake: When Rachel and Tag are in the hall at the end of the episode, the tan mark from Jennifer Aniston's wedding ring is visible on her hand. (00:19:15)

Kara

The One Where Chandler Doesn't Like Dogs - S7-E8

Revealing mistake: While Monica is sneaking the dog back to her apartment and Chandler is in the toilet, as Monica lifts her hand to her mouth she whispers, "Up!" to get the dog to stick its head out of the handbag. (00:15:00)

The One With Monica and Chandler's Wedding, Part 1 - S7-E23

Revealing mistake: When Monica leaves the apartment and Chandler stays listening to the answering machine, check the wall beside the door. It changes the angle, as if somebody moved it (probably to hide the hall).

The One With Monica and Chandler's Wedding, Part 1 - S7-E23

Revealing mistake: When Monica leaves her apartment in the scene where she thanks Chandler for staying calm since they got engaged you can see the wall on the left side of the door moving as the door closes.

immanuel

The One With the Holiday Armadillo - S7-E10

Revealing mistake: When Ben sits on the sofa to listen to Ross talk about the festival of lights, you can see Monica move Ben to the other side of the sofa despite there being space for her to sit. This is so they sit in the correct order as she would mask Ben to the cameras.

deadexcel

The One With The Truth About London - S7-E16

Revealing mistake: When Monica gives Phoebe the headache medication (Hexadrin) she, not only doesn't take the lid off - and therefore fails in pretending to put it back on - but also doesn't actually give Phoebe anything. Extended episode. (00:07:30)

The One Where They're Up All Night - S7-E12

Revealing mistake: When Chandler is getting a pan out to warm some milk, he successfully pulls the bottom pan out without too much disruption, however, the joke (and entire plot device - to wake Monica up) is to make as much noise as possible so Perry pulls out more pans on purpose and knocks them on the floor. This is quite clear - you can see him grasp the wok and pull it out onto the floor. (00:06:30)