 The extra scene at the end with Ewan McGregor (qv) and  Renée Zellweger (qv) singing a duet was filmed at the insistence  of the actors. They said that with both of them having been in  musicals previously (McGregor in _Moulin Rouge! (2001)_ (qv) and  Zellweger in _Chicago (2002)_ (qv)) that it would be a sin not to.