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 Part II trailer was released online in February 2011. The first full trailer was released in April 2011. Later in the same month Warner Bros. pulled the trailer from theaters for violating an MPAA rule stating that films can only trailer before similarly rated movies. The trailer for the R-rated comedy was being promoted at screenings for the PG-13-rated "Source Code" against MPAA regulations. Warner Bros. released a statement saying, "In our haste to meet the placement schedule for this trailer, we failed to properly vet the final version with the MPAA. We acted immediately to correct the mistake and removed the