Some thoughts
At the beginning as she leaves work and walks down the street like 30 men in a row catcall to her!
She is raped in two different locations by two different men (not acting in concert) within a few minutes!
After she killed the first guy, her second rapist, why didn't she just get the police? It would have probably been justifiable self-defense since he was prepared to use lethal force (the gun) and he just raped her.
She starts off by killing men who make some sort of advance or threaten her, but then she kills total random men who were no threat to her. This seems odd, even in a psychotic state you'd think she'd limit herself to the abundance of threatening men in NYC who would harrass her.
Also she was so shy, meek and demure and since the rapes she starts to dress very provacatively to lure men I suppose. This is possible, butagain is at odds with what seems to have been her normal mode of painful shyness. I guess feminists would say she is now fully liberated! hehe.
The Halloween party scene was very cheesy and rather silly lol.
Overall a good revenge film and well worth the $62,000 budget!