well comments on the trailer are that its a bit too long and editing isnt that fast building up to horror bit so there isnt much suspense their. also audio of voices should flow through shots i think because it breaks up the footage from each other a bit to much through similar shots of one area/timezone etc...
the neck slashing camera angles look a bit didgy yt nice effects, maybe xtreme colse up on slashing guys face as he does it, dont really like the shot of his back there.
thats all i can t hink off, nice trailer are you using the new sony HD handheld or something?