The Hangover Part II takes no chances and opts for a safe, subdued pre-wedding brunch. Things do not go as planned, resulting in another bad hangover with no memories of the previous night. Development began in April 2009, two months before "The Hangover" was released. The principal actors were cast in March 2010 to reprise their roles from the first film. Production began in October 2010, in Ontario, California, before moving on location in Thailand. The film was released on May 26, 2011 and became the highest-grossing R-rated comedy during its theatrical run. A third and final installment, "The Hangover Part III", was released
The Hangover Part II did not come to an agreement, the former party aimed to digitally modify the tattoo from Helms' face for the home video release. In June 2011, Warner Bros. settled the lawsuit with Whitmill; the terms of the settlement were not disclosed. In January 2013, the "University of Illinois Law Review" published an article addressing this case and discussing in detail the implications of Whitmill's claims. In 2011 an Australian stuntman who was injured while filming in Bangkok sued Warner Bros. The case was settled out of court for an undisclosed sum. In June 2012 Warner Bros successfully defended a lawsuit