Continuity mistake: When Dracula charges at the cross atop the altar, Elisabeta's blood can be seen on the floor in the background. When Dracula is holding the communion chalice, the stains are darker, and change position. (00:04:35)
Continuity mistake: When Jonathan is comforting Mina on the train, after Mina says, "Oh, what have I done to you", her head, resting against the couch, keeps moving up/down between different camera angles. (01:45:45)
Continuity mistake: After Dracula bursts into the room, interrupting the vampire orgy, the amount and position of the blood on Jonathan's face keeps changing between shots. (00:34:15)
Continuity mistake: When Vlad is kneeling next to Elisabeta's body, as he picks up her suicide letter, a part of the priest's shadow can be seen above her head, without the priest standing there. The shadow can also be glimpsed in a shot from the same angle a few seconds earlier. (00:03:20)
Continuity mistake: In the shot where Mina sits down on Lucy's bed to share the happy news, Lucy's upper body is propped up against a pillow and the top of her head is positioned above it. In the following shot from behind her head, her upper body is resting on the mattress and only her head is positioned against the pillows. When the scene cuts to a close-up of her face, her entire head is positioned below the top of the pillow. (01:11:10)
Continuity mistake: When Mina begins drinking blood from Dracula's chest, as he stops her, her face and teeth are clean. Two shots later, before she continues drinking, there's blood on her chin and her teeth. (01:40:40)
Other mistake: When Jonathan and Mina get married, he gives her wine to drink, which she somehow manages to do without removing the veil from her face. (01:20:25)
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