It has to be stylized, it's an entertainment medium and an art form, so liberties are going to be taken in that regard and that's to be expected...But, in saying that, I agree with you. I think his hair needs to change. (eyes do look funny too)
Not sure about the monk style do but perhaps something just longer and a bit more unkempt than the contemporary shaved sides long on top style quiff. It certainly doesn't align with the era or time period as it is right now.