The One With Ross's Grant - S10-E6
Continuity mistake: When Monica comes round to Phoebe's, Phoebe reminds her that she's got to clear out stuff. In this wide shot Monica has both hands by her sides, but when it cuts to her finishing saying "oh right", her right hand is now gripping her bag's strap. (00:05:00)
The One With The Late Thanksgiving - S10-E8
Continuity mistake: The food/sauce stain Joey gets on his shirt (after running into the cart) changes between shots. (00:20:50)
The One Where Ross And Rachel Take A Break - S3-E15
Continuity mistake: When Monica and Phoebe are eating with the diplomat and his translator, watch the translator's chocolate cake. It either rotates, has some taken out of it, or is a different piece. Whichever way, the cake changes size, shape or position without him ever touching it. (00:18:10)
The One With Princess Consuela - S10-E14
Continuity mistake: After the scene Mike and Phoebe are arguing about changing their names in Central Perk, just before Phoebe meets one of her clients, a purple cup disappears off their table. (00:19:40)
The One With The Joke - S6-E12
Continuity mistake: Joey and Chandler are talking about money, and Joey picks up the Playboy magazine saying Ross gave him reading material. He sets it down on the counter, but in the next shot of the magazine, it has moved farther down the counter. (00:03:10)
The One With The Truth About London - S7-E16
Continuity mistake: When Joey is reading his speech about all the giving and receiving, Chandler has his legs on the table at the coffee shop. You can see his shoes on the table when they show Joey, but when they change the shot to Chandler his legs are on the floor and crossed. (00:10:55)
The One With The Truth About London - S7-E16
Continuity mistake: In the flashback, Chandler says to Joey that he is watching a movie when the camera cuts to show the blank screen. In the reflection, you can see that there is no-one present in the room. (00:18:20)
The One With Ross's Inappropriate Song - S9-E7
Continuity mistake: When the veal is served, Phoebe looks at her plate twice. (00:16:55)
The One With The Chicken Pox - S2-E23
Continuity mistake: When Monica says about Richard not having a 'thing', her arms change place depending on the shot. (00:14:10)
The One with the Stoned Guy - S1-E15
Continuity mistake: When Chandler shows Phoebe his office he opens the blinds. In the next shot a pile of books have appeared on the window ledge. (00:14:40)
The One with the Stoned Guy - S1-E15
Continuity mistake: During the scene when Chandler arrives with his test results, Phoebe is reading a book with a red section on the left hand page. In the next shot, the red on the page has vanished. Then, in the next shot, the red page is back again. Also Phoebe's left hand moves between shots. (00:07:15)
The One Where Chandler Crosses The Line - S4-E7
Continuity mistake: When Ross and Phoebe are talking in Central Perk, Phoebe's position changes. (00:14:45)
The One With the Breast Milk - S2-E2
Continuity mistake: When Ross thanks Monica for going shopping with his new girlfriend, Monica has her arm up, and the camera cuts, the arm is down with no time to do so. (00:04:00)
The One With The Ultimate Fighting Champion - S3-E24
Continuity mistake: When Robin Williams calls Billy Crystal a b*stard, Monica's purse goes from on her lap to being on her shoulder. (00:01:30)
The One Where Ross And Rachel Take A Break - S3-E15
Continuity mistake: When Rachel is sitting in the window seat talking to Mark on the phone, the glass and the wine bottle move closer to each other. (00:15:50)
The One With All The Jealousy - S3-E12
Continuity mistake: When Ross and Rachel are talking about his playdate with the stripper, a lady in a black vest talks to the people at the table behind them, then goes to the bar and shakes hands with a lady in a black jacket. She does all this again in another shot. (00:19:30)
The One With Phoebe's Dad - S2-E9
Continuity mistake: In the scene when Joey is asking Ross to show him the presents he bought, Joey uncrosses his legs twice. (00:03:20)
The One With All The Resolutions - S5-E11
Continuity mistake: When Ross first enters Elizabeth's bathroom, the lotion is first in line on the shelf; next to it is something else and then the powder. Later, the powder is first in line on the shelf and the lotion has moved. (00:09:30 - 00:12:45)
The One With Rachel's Other Sister - S9-E8
Continuity mistake: When Amy and Rachel are arguing in Monica and Chandler's apartment, the door behind Amy leading to the guest room changes from open to closed in almost every shot. (00:19:05)
The One With Rachel's New Dress - S4-E18
Continuity mistake: In The One With Rachel's New Dress, she's in her underwear on the sofa when Joshua comes in. In wide shots focusing on Joshua she's quite laid back, but in close shots of her she's sitting more upright. Worse than that, her legs are crossed, but uncross in the shot of his parents coming in, only to re-cross in the next shot when she gasps. (00:14:35)
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