In the beginning of the film The Nines Ryan Reynolds' character gets out of the shower and freaks out because he does not have a belly button. This, of course, is later explained being that he's not actually human, but a God like entity that has created the entire world around him... However, there are several shots in the film where we can see he clearly has a belly button... Was this just something that was overlooked in production? Or, was it due to the crack he and the hooker had obtained earlier in the film? I know the movie has many different interpretations of various events throughout, I was just curious.
The most obvious explanation (e.g. as to why he has a belly button in later scenes) is that it was indeed overlooked in production.
Ryan Reynolds states in this interview that his lack of belly button was an integral part of the plotline so it's very unlikely that they would have deliberately subverted it without some kind of callback.