Fast Forward to the scene where Renfield is in the jail cell and Dracula is going to help him excape. Dracula pulls the bars apart, as if he were very strong, but if you watch carfully you can see the bars wiggle around as if they were made of rubber.
come on dude, get a life. everyone with even the slightest sceric of intelligence (or not) would realise that this film wasn't made for realistic accuracy. for example how come Dracula was clinging to the roof with the greatest of ease, considering he'd have to be holding on with his back, but when the door slams he fell. ??? explain that??? what about when renfield is eating the bug, you can clearly see that he is wiggling a fake leg around but no-one cares. its entertainment dude, enjoy it.