Three buddies wake up from a bachelor party in Las Vegas, with no memory of the previous night and the bachelor missing. They make their way around the city in order to find their friend before his wedding.
Lindsay Lohan was initially offered the part of Jade, the stripper, but turned it down. She did not like the script and thought the movie would bomb. Heather Graham was given the role instead. Lohan later admitted to regretting the decision.
Stu's missing tooth didn't need any effects or prosthetics. Ed Helms never had an adult incisor grow, and his fake incisor was taken out for the parts of filming where Stu's tooth is missing.
The songs "Stu's Song" and "Three Best Friends" were respectively improvised by Ed Helms and Zach Galifianakis.
While filming "The Hangover," comedian Ken Jeong added little inside jokes into the movie to make his wife, who was battling breast cancer, laugh when she watched it.
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