As Taste and Whippit are leaving their apartment, Taste says "Don't let yourself get attached to anything you are not willing to walk out on in 30 seconds flat". This is a reference to a quote from the movie Heat (1995). William Fichtner, who plays District Attorney Frank Crenshaw, was in Heat.
During the scene where Phil is puking in the street after running from the 2 thugs. The are several bystanders that walk by multiple times in both directions. Specifically with 2 women in the blue shirts.
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?
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.