Russell Brand filmed scenes performing as rock star Aldous Snow at his sell-out comedy show "Scandalous", in front of 20,000 people, at the O2 arena in London. Jack Black and Jason Segel joined him on stage.
A 4.0 earthquake occurred while filming a scene between Aaron and Daphne. The quake and Jonah Hill's startled reaction were captured in the take and included in the DVD's gag reel.
The photo Aldous pulls out of himself as a young, chubby boy is an actual photo of Russell Brand as a child. It's featured in his autobiography "My Bookywook".
The song Aldous's father plays on the guitar is one of Jason Segel's songs from Forgetting Sarah Marshall (2008).