Continuity mistake: When Fred Francis is at the control booth, his stance changes between every shot, from standing up straight, to bending over, with his leg up, then down, etc. (00:09:35)
Continuity mistake: When werewolf Eddie takes the file from Terry's hand, while she's on the phone, the phone drops from her ear, to the floor, twice between shots. (01:00:45)
Answer: Whether it be dog or wolf, the primal instincts take over. Every creature, in nature, has an urge to seek out their own kind. When the husbands were bitten, they are consumed with the desire to hunt, kill and mate.