Roughly 5 minutes into the film, in the Brooklyn cut scene after eating family dinner and before the scene at the fabric shop a late model Honda Civic sedan (Produced starting in 2006) can be clearly seen, even though the movie is set in 1998.
The movie is set in 1998 and you can clearly see cars that have license plates that were not used at that time.
The bottle of perfume Rachel hands Sam to give to his mom is Calvin Klein Euphoria, which was not released until 2007.
The movie is supposed to be set in the late 90s, but the Freedom Tower (built on the 9/11 site and under construction) can be clearly seen in the skyline.
In a scene between Sam and Rachel in an apartment there is a more recently designed bottle of Vitaminwater on a table bar top (tropical citrus flavor?). As a site note, Glacéau's brand of VitaminWater was not distributed until the early 2000's which puts the product a few years off from when the film was meant to be depicted.
About 40 minutes into the movie, when the European drug lord shows his operation, he says "This thing's capable of producing 300 pills a minute, over 100,000 an hour." However, 300 pills a minute would account for 18,000 per hour.