The initial script was written for Downey's character to be Irish, but was altered after Downey stated he could improvise better as an Australian (he had previously played a similar outlandish Australian character in the film Natural Born Killers).
I det oprindelige manuskript skulle Downeys karaktere være af irsk afstamning, men dette blev ændret, da Downey mente, at han bedre kunne improvisere som australier (han havde nylig spillede en lignende udenlandsk australsk karakter i filmen Natural Born Killers).