
Continuity mistake: When the great doors to Dracula's castle open, an ornate table with a statuette and two large candle holders is standing inside the castle. When Dracula's shadow appears, the statuette is still there, but the candle holders are gone. (00:12:35)
Answer: It's unlikely they were falling in love with Harker: they are sadistic, baby-eating monsters who regarded Harker as food and a temporary plaything. As for them sleeping in the open, the local populace dreads and avoids Dracula's castle, so there's hardly any fear of intruders. Van Helsing did enter and kill them, but they reckoned, mistakenly, that he too would be too afraid to do so, especially after their horse-mauling escapades the previous night.
Jukka Nurmi