Also, the weird scene where Kumar goes off into the woods to pee, gets approached by a weird guy coming from the opposite direction who decides to pee on the same bush, and who gets very angry when Kumar asks him why he picked that particular bush when there are so many other ones available
The police's treatment of black people in this movie was already political satire back in 2004, but a decade later it becomes an even bigger hot-button issue. For a specific example, see below.
When the police come back from the station, they completely ignore Harold and Kumar (the ones actually committing a crime), and immediately attack the unarmed black man who was sharing Harold's cell, accusing him of trying to escape and misidentifying the book he was reading as a gun. In 2016 in Charlotte, North Carolina, police that were serving an arrest warrant for an unrelated case started attacking an unarmed black man that was sitting in his truck waiting for his son, accusing him of possessing marijuana and misidentifying the book he was reading as a gun. The big difference is that the latter resulted in said unarmed black man being shot to death.
Also doubles as a shoutout to Tommy Boy, when Tommy and Richard initially express disdain for the sappy radio station they're listening to in the car, but end up singing along to the Carpenters' "Superstar" at top volume while sobbing uncontrollably.
He Really Can Act: This movie is what really put Neil Patrick Harris' child star life behind him.
Hilarious in Hindsight: Neil Patrick Harris plays a drug-addled pervert obsessed with getting women, several years before he publicly came out as homosexual. By the third film, the fictional version of Harris has also come out, but only as part of a strategy to get women into bed.
Ho Yay: This movie is positively filled with subtext for Harold and Kumar's relationship.
Kumar licks Harold's face because he "thought you'd wake up if I did some gay shit."