*Season 6*
The indelible writing that was on Ross and Rachel's faces is gone! Whilst the manufacturer had assured Ross in TO In Las Vegas it wouldn't come off. (Erica)
When Monica and Rachel are playing tug-of-war with the candlesticks, right before Monica says, "You wanna each take one?" Monica is holding the candlestick up the right way, but then when the camera changes position, you see the the candlestick is upside down. (Shay)
Anyway, when I was riding on my bike from school to home, I tought of another blooper. In TOW Joey's porsche, he asks Gunther if the keys are his. Gunther says: Yeah, I make 4 bucks an hour, that's what i drive. But later in series 6, when Joey wants to work at the coffeehouse, Gunther tries to hire him and tells him, that it pays very well working there. I don't know if Gunther was joking by telling him about that making 4 bucks an hour, but still..
When Rachel wakes up in Joey's place after throwing up the day before, right as she says she's a terrible person, the strap of her bra is down on her arm, and the next shot it's on the right place. (Marthe Scheffer)
Rachel has a little talk with her sister,about her going out with Ross. You see Rachel sitting down, then a cut to Jill who sits down, and then back to Rachel ,who sits down AGAIN... (Marthe Scheffer)
in the beginning, Phoebe is drinking from a cow-mug in her hand and when she begins to put her mug down on the table, except that there is an obvious cut and the cup moves directly to the table faster than she ever could do it. It's an obvious cut because in the next shot she is relaxed with her arms crossed.And also,(note: this isn't a real blooper) but just about bad acting, coz when Gunther comes over to Joey and tells him: What did I tell you about talking to your friends while workin?" Joey: euh, do it? And then he graps the mugs: says: where was I, and takes a drink out of the mug of coffee, but you can notice that there's nothing in the mug, coz he drinks like he tries to get the last bit out of the mug, so if the mug was full, than he would have got coffee all over him, but he didn't. (Marthe Scheffer)
When Chandler is talking to Monica about how he thinks (to confuse her) that marriage is waste of time, Monica's hair keeps moving from tucked in behind her ear and hanging in front of her face. This was an obvious editing error because when Chandler asks her "why do people even get married", you can see that the reply monica gives him is done by editing. (Caio)