Plot hole: When Dan is chasing after Carter to catch him and Alex together at the restaurant, there's very little chance he could have had any idea where Carter was going. He couldn't have told the cab driver to "follow that taxi" because in the time between Carter getting in a cab and Dan getting in a cab about 5 taxis drive past, so how he happens to end up at the same place is a miracle.
Plot hole: Bridget is wearing a shirt from Mrs. Darcy (the line about Mark's mother's taste in shirts, which is said while showing BOTH shirts, definitely suggests that - her idea of cuteness for a couple, I guess), which doesn't make sense because the first movie ended on New Year's Eve (we know that because Shazzer and the rest of the gang were taking Bridget to Paris that night to celebrate the New Year, but Bridget ended up with Mark - unless the movie take place a year later, which it doesn't, it takes place the next day). Consequently, there is no way Mrs. Darcy would have known about Bridget and Mark in time to get her a shirt too and offer it to her. Mark couldn't have brought it to Bridget, because she arrives alone at her mother's New Year's Day turkey curry buffet; Mark is already there, wearing the shirt his mother gave him, which suggests they split ways that morning, after their first night together.Sereenie
Plot hole: When Jo is getting to walk down the aisle with Queen Clarisse, he hands Shades his top hat and then pops his ear piece right off, in a split second, and puts it in the top hat. In the previous scenes, Princess Mia has Lionel's ear piece stretched from the back of his neck, across his jaw and around his chin and then stretched to her ear but it hasn't popped out, while Queen Clarisse jerks Charlotte with her when she goes to listen to Princess Mia.Sheri Hartman
Plot hole: During the scene when Miles is in the hotel room asleep while Jack is out with Stephanie, Christine calls Jack on his cell phone and then on the hotel phone. First disturbed and awakened by Jack's cell phone ringing, Miles gets up to check it to see who is calling. He sees that it is Christine calling, and then lays back down. The cell phone shows Christine calling and then IMMEDIATELY afterward, it says that there is a voicemail waiting. That certainly was an extremely short amount of time in which to leave a voicemail.
Plot hole: Lucy has been painting pictures of Henry since she moved into the institute. But she passes him at the zoo and doesn't recognize him.
Plot hole: Near the end of the film it's revealed that Drew grew up poor with only his mother, who had to work double shifts to survive. So how did they afford that huge house? Even the Valcos are supposed to be struggling financially yet they now live in this massive house too.