Why isn't this listed as a comedy-drama? *spoilers*

I mean, with the clear tongue-in-cheek atmosphere of the film, I was laughing several times throughout. The scene near the end where Arthur purposefully overacts, the witty narrative, all up to the 'sequel' screen at the end.

For me, at least, this is one of the wittiest, most fun of any of the comedy-dramas I have seen.