The One With The Lottery - S9-E18
Continuity mistake: In TOW the lottery tickets series 9 just after Chandler has got the job and he sits down you can see Joey's hand in the right side of the screen however when the shot changes Joey moves his hands up to the position we have just seen. The shot changes back and his hand is in the same position. (00:18:50)
The One With The Lottery - S9-E18
Continuity mistake: In The One With The Lottery, Chandler is on the phone to find out if he got the job, he then hangs up and rolls up one of his sleeves. In the next shot of him both sleeves are rolled up. Then you can see his sleeves slip down again, but when it cuts to a closer shot, you can see they're rolled up again. (00:04:40)
The One With The Lottery - S9-E18
Continuity mistake: In the scene where Joey and Phoebe are holding the lucky bone, which they have to break and make a wish, look at Joey's thumb; the location of it changes between shots. (00:05:40)
The One With The Lottery - S9-E18
Continuity mistake: After he gets the job Chandler sits on the couch pretending to read a magazine and Joey drops a piece of paper that materialises in his right hand in between shots. (00:19:40)
The One With The Lottery - S9-E18
Continuity mistake: Joey's thumb on the wishbone changes positions as the camera switches between Joey and Monica.
Answer: The statements that she's contradicting (that it is common, it happens to every guy, and it's not a big deal), are the things that a woman commonly says to a man who is suffering from erectile difficulty, typically to assuage his bruised ego. However, most men do not believe that these statements are true, as evidenced by Chandler's outburst. He's so caught up in the proof that women are lying about it that he gives himself away.
Rooster of Doom