I never thought an actor would care how the were portrayed as long as they got paid, but then I saw Michael J Fox on a late night talk show talking about his he required them to use a waist grabber with the hot toys mcfly figure and now I can only imagine what kind of wacky issues people demand.On the other hand, license holder or the actor can request their likeness or expression. So Venkman having thick hair and the hairline more forward than it was in the movies, could be a personal request of Bill Murray himself. We never know.