Continuity mistake: When Mel tries on the pantyhose, the hole in the left leg changes from large on the outside of his leg, to small with a run on the outside of his leg to large on the inside of his leg. (00:25:45)
Continuity mistake: When Nick first enters Sloane Curtis and is talking to one of his male co-workers, in the background there is a man in the typing away at his computer. He gets up and walks off, then the camera angle changes for a few seconds. When it returns, the man returns to his computer. It cuts away and returns a few more times, rather quickly, each time showing the man returning to his computer. (00:08:35)
Other mistake: When Nick thinks he is going to be promoted he talks to his PAs about moving to the 44th floor. In the shot of the office building (after he leaves the coffee shop on the way to work) it's obvious that the building only has about 10 floors.
Continuity mistake: When Mel is watching TV on the sofa and serving himself from a bottle of champagne you can see a front view of him using his right hand and tilting the bottle toward his right side, then there is a change of scene (from the back of the sofa) and his right hand his tilted to this left side. (00:20:35)
Continuity mistake: Just before Mel says "You go girl" he grabs a bottle of wine by the neck, then the camera switches view, and he is holding it at the middle of the bottle
Revealing mistake: When Mel Gibson is in Marisa Tomei's apartment he goes to the WC to talk with his "little friend". He just got out of her bed and he is supposed to be naked. While sitting on the toilet he is filmed from the waist up but you can clearly see on the left corner of the screen that he is wearing a dark piece of underwear.
Factual error: I live in Chicago, and live near where they filmed the outside shots. Every time we see Mel coming out of his apartment, the address says 2400 Lakeview Drive. However, anyone who lives by here knows that this particular building has no balconies, and Mel repeatedly went out, or looked over his balcony. (00:05:20 - 00:43:00)
Continuity mistake: In the scene where Mel Gibson is in the department store trying to listen to womens' thoughts (to see if he has successfully rid himself of his "gift"), you can clearly see he is standing on a white marble floor. A couple of shots later (when he discovers that he still has his "gift"), the camera angle moves above his head as he looks toward the ceiling; you can clearly see that he is now standing on an inlaid marble star in the floor. (00:46:16)
Continuity mistake: When Mel Gibson And Helen Hunt are in the bar having drinks, Helen has a Martini with two olives on a toothpick. When they start talking, she takes the olives out of her drink. In the next shot, she takes a sip of her drink without the olives. They talk for a few more seconds, then Helen goes for another sip and she is taking the olives out of her drink again.
Continuity mistake: The young Nick doesn't have "baby blues" as his ex-wife describes them in the opening credits. (00:02:45 - 00:03:30)
Continuity mistake: When Darcy arrives at Sloane Curtis and is passing out the boxes with the marketing ideas for the people to take home and come up with ideas, she slides a box down to Nick at the end of the table. When he grabs it, his thumb is on the top of the box and his fingers are on the back of the box. The next shot his thumb and index finger are on top and the other three fingers are on the back.
Continuity mistake: When Mel Gibson is in the doctor's office and he comments on the lamp that she bid for on Ebay by reading her mind, she also has the auction page up on her computer. If you look closely you will notice that the auction is not an Ebay auction, but rather a Yahoo! auction. (00:47:30)
Audio problem: When Mel Gibson is writing the letter to Helen Hunt after the Nike deal is done, he closes the laptop part way and a clicking sound is heard even though he has already removed his hand from the laptop. However, the Powerbook G3 he's using doesn't click at half way. Then, at the next shot, a few seconds later, the laptop is closed but there was no clicking sound while the camera was looking at Helen, even though there should have been one.