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).
Prema originalnom scenariju Downeyjev je lik trebao biti Irac, ali je prepravljen kad je Downey rekao kako bi mogao bolje improvizirati kao Australac (1994. je glumio sličnog komičnog australskog lika u filmu Rođeni ubojice).