Corrected entry: The first version of Central Perk's logo, seen from season 1, presents a perspective error on the right top corner of the left cup of coffee. Some seasons later, the logo receives a tiny correction in the same area, that makes the perspective "OK" to the eye. The cup line straightens up, and the steam is brought a little closer to the ribbon containing the name.Gui Petrini
Corrected entry: When Joey and Chandler are ordering a pizza they tell the pizza place to send the food to apartment 20 which is Monica and Rachel's apartment but it is clear that Monica isn't home because she is catering and Rachel is on her date with Ross, so how do they get the pizza.
Corrected entry: Phoebe shows Ross' invitation to everyone, stating "Ross let Ben address mine." The envelope has poor kid like handwriting. The address is a 4 line address and the invitation also has stamps on it. When the camera comes back to Phoebe, she's holding an envelope with just her name on it, with no stamps. When she puts down the envelope by her side, the 4 line address is back.
Corrected entry: Towards the end of the episode, when Chandler comes into the apartment to talk to Joey about his kiss with Kathy, Joey turns the TV off and places the remote on the counter. However, the TV is suddenly back on after Joey asks, "Is that why you bought all this stuff?" (referring to the furniture), and then Joey turns it off again manually.
Corrected entry: When Chandler and Phoebe go to the jewelry store Phoebe's hair has two braids on each side that are being held together by what appears to be a hair pin, later on the scene where Phoebe is trying on a tiara she only has one braid on each side and no hair pins.
Corrected entry: When Phoebe and Chandler are about to kiss there is a bottle of wine and two glasses on the counter. It then cuts to a view of Phoebe with no bottle or glasses on the counter, just a phone, and then later in the same scene it cuts back to Phoebe again and there are two glasses and a bottle of wine again.