In all of Mark Wahlberg's scenes, he is shirtless. His scenes were carefully filmed at specific angles to avoid showing a tattoo of Bob Marley that he has on his left shoulder.
Despite the fact that his character's minimal apparel is a running joke throughout the movie, there is a dedicated wardrobe assistant to Mark Wahlberg listed in the end credits.
In the chase scene with the taxicab and Audi stuck together, you see Holbrooke's Audi smash into several cars. If you pay close attention, you can see that the left front tire and wheel is destroyed after impact. In the very next scene, the Audi is seen with all four wheels intact. The same thing occurs a bit earlier in the scene, with the right rear tire and wheel being destroyed.
When the Fosters are on the subway, the signs behind them indicate that they are on a 1 train, but the subway car does not match those that run on the 1 line.
The Fosters 'borrow' Holbrooke Grant's Audi and drive to 135 Avenue D (the real Tripplehorn apartment). In the ensuing driving/chase scene, mere blocks after the chase begins they pass a very conspicuous awning reading "226 West 9th Street." Moments later, they drive on a Manhattan Avenue, passing a street sign for "Spring Street." Such a driven journey would be impossible in the elapsed movie-time.
What are the differences between the Theatrical Version and the Extended Version?
A
The running time difference in total sums up to approx. 15 minutes (w/o ending credits), about 10 of those are made up of big and important differences. These are mostly alternative scenes, the smaller differences in contrast are usually one or more added sentences. The new scenes add to the movie's quality and make it even more funny than it initially was already. Good examples for this are the scenes with the couple asking the Fosters for money or the ones in the subway. A detailed comparison between both versions with pictures can be found here.