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 Blu-ray'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' father plays on the guitar is one of Jason Segel's songs from Forgetting Sarah Marshall (2008).