Trivia / Harold & Kumar Go to White Castle
California Doubling: Much of the movie was shot in Canada. The White Castle in the end was actually constructed on site because there are no White Castles in Canada.
Dawson Casting: Harold is supposed to be in his mid-20s, but John Cho was 32 when it was released.
Deleted Role: The movie originally ended with Harold meeting Maria's brother, played by Luis Guzman, who Harold initially mistakes for her boyfriend, and learns from him that Maria has gone to Amsterdam. As humorous as it was, Word of God decided it'd be better having Harold actually see Maria one last time before she goes to Amsterdam.
Funny Character, Boring Actor: Inverted with John Cho and played straight with Kal Penn, who have both said their real-life personalities are more or less the reverse of their characters'.
Irony as She Is Cast: Kal Penn, playing an unrepentant stoner, has said that he actually has zero interest in marijuana and has never tried it.
Playing Against Type: Neil Patrick Harris. He's credited as "Neil Patrick Harris as Neil Patrick Harris".
What Could Have Been: According to co-writer Jon Hurwitz, had Neil Patrick Harris turned down the role, Ralph Macchio was their second choice of "Wholesome 80s star".
The producers wanted to play Queen's "We Are The Champions" as Harold and Kumar eat their White Castle burgers, but they couldn't clear the rights to do so.