Visible crew/equipment: While Natalie is stocking Nick's kitchen with groceries, a shiny pot on the shelf over the stove captures a reflection of several crew members standing on the other side of the set. (00:24:55)
Visible crew/equipment: When Natalie is telling the amnesia-stricken Nick that he's a vampire, an equipment shadow moves across the stove in the lower right hand corner of the screen. (00:35:15)
Answer: Nick was sick and tired of being an immortal bloodsucker. He wanted to be human, fall in love, get married, have children, grow old and die. As for Janette, according to her, she fell in love and the passion she felt "cured" her of her blood lust.