The Hangover Part II did not have the full support of my entire cast and crew." Liam Neeson replaced Gibson after being invited by Cooper, who worked with Neeson on "The A-Team", to take the part. Neeson, a fan of the first film stated, "I just got a call to do a one-day shoot on 'Hangover 2' as a tattooist in Thailand, and that's all I know about it". Gibson was reportedly furious over the decision. A source close to Gibson stated, "He doesn't understand why Mike Tyson, a drug user who turned his life around, was given a chance while Mel was kicked
The Hangover director, appears as Mr. Creepy, who appears briefly in an elevator. Mike Tyson appears as himself; Tyson originally refused to appear in the film, but he changed his mind when he found out that Todd Phillips directed "Old School", which Tyson liked. Tyson later said that working on the film convinced him to change his lifestyle. Professional skateboarder Mike Vallely portrays Neeco, the high-speed tuxedo delivery man. Las Vegas personalities Wayne Newton and Carrot Top appear as themselves in the photo slide show. The plot of "The Hangover" was inspired by a real event that happened to Tripp Vinson, a