Blooper

Chandler comes out of the bathroom with the lotion. Phoebe enters and they decide to kiss. Chandler no longer has the lotion in his hands.

In the scene where Chandler and Monica confront Joey, Joey's arms change position from shot to shot. In at least two instances, for example, his arms change from spread out to down at his sides.

When Rachel and Phoebe confront Joey, the positions of Rachel's arms change radically between shots.

Ugly Naked Guy's apartment interior is shown by the first time. The way the rooms are distributed doesn't match with previous descriptions. Yet, he could have done many makeover to his apartment the time he lived in it.

When Chandler tells Phoebe he can't have sex with her because he's in love with Monica, Monica runs out of the bathroom surprised. However, back in The One with All the Thanksgivings (1998), Chandler tells Monica he loves her after she cheers him up.

Phoebe says to Chandler that it's their first kiss, however back in The One with All the Kissing (1998), Chandler kisses Phoebe. Phoebe statement can be inferred as their first romantic kiss, as the previous kiss was supposed to be meant as a greeting/goodbye.

In the street shot after the gang gapes at "Naked Ross," a bicyclist appears to run a red light.