<P> A week after the release of Forgetting Sarah Marshall, Universal Studios announced a new film Get Him to the Greek, reuniting Jonah Hill and Russell Brand with writer / director Nicholas Stoller and producer Judd Apatow . Variety initially announced the project would focus on "fresh - out - of - college insurance adjuster (Hill) who is hired to accompany an out - of - control rock star (Brand) from London to a gig at L.A.'s Greek Theatre ." In July 2008, Brand mentioned that he would be reprising his Aldous Snow role from Forgetting Sarah Marshall, in a new film from Apatow in which the character was back on drugs . </P> <P> In an interview with CHUD.com, Apatow would later reveal that Get Him to the Greek was indeed a spin - off of Forgetting Sarah Marshall with Brand again playing a no - longer - sober Aldous Snow while in a different interview Nicholas Stoller said that Jonah Hill will play a different character named Aaron Green, a young music executive . </P> <P> While Brand was backstage at the Paramount studio lot preparing to present the 2008 MTV Video Music Awards, he approached Christina Aguilera, Pink, and Katy Perry about filming cameos for Get Him to the Greek . </P> <P> Rehearsals began on April 27, 2009 and filming began on May 12 of that year . The film was shot in New York City, Las Vegas, Los Angeles and London . News footage featured in the film was filmed after a Russell Brand stand up performance of "Scandalous" at the O2 Arena in London, which most of the audience stayed for . While filming in Trafalgar Square, Brand was pushed into a fountain by a passerby . </P>

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