can the hair on ma cà rồng grow?

I don't think so. Once an individual is changed into a vampire, he hoặc she is Nữ hoàng băng giá for eternity. Nothing about them can change; face, hair, height, weight, physical age etc.

However, for half-vampires it can. Renesmee's hair continuously grows as she ages :)

No. Usually when one is turned into a vampire, they are physically bound for all eternity. Their physical appearance can't change.

Yes, the continuity errors are endless. Edward's hair, Esme's hair, Alice's hair, everybody's hair!

i think so, i mean look at edward, hes got hair all over

no they can't because when they turn into ma cà rồng thay are Nữ hoàng băng giá for all eternity and nothing of them change not their hair,their height,their weight,their age,their looks hoặc any inner movement(wink wink) eather so the reason that his hair changed is cause of a continuity error