Because somebody assumed that all films advertised as being about mistaken identities are comedies.
After all North by Northwest and Charade were such a laugh riots. 
More than likely they wanted those two just to show up so they can get their picture taken with them and maybe Brad Pitt.
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Odd you say that cause there seems to be a few people saying films were getting the nod because of the stars in the movie. The golden globes must want more faces in attendance for creditability.
I really enjoyed it and think Angelina Jolie is really good and very beautiful however this is not a review (I suck at those anyway). I just had a question for people that have seen it or know about the movie in general.
Why the hell is Angelina Jolie and Johnny Depp up for best actors in a comedy or musical at the golden globes? That movie is neither.