1) Let The Right One In is a horror film with elements of romance that subverts some genre conventions by not having the evil creature defeated and even having it help the protagonist.
2) The film uses editing techniques like blank screens, snow falling, and toggling between characters to build tension and develop empathy for the characters. Faster cuts are used during tense scenes while slower cuts show graphic actions.
3) The target audience of the film is broader than a typical Western horror audience by being Swedish and having a more subtle horror and a romance subplot to appeal to more than just those seeking to be revolted.