First we need to know the principles of Haram in Deen. There are only five categories which are Haram as described in Sura A’raf 7:33:

Tell them (O Muhammad): ‘My Lord has only forbidden indecent acts, whether overt or hidden; all manner of sin; wrongful transgression; and [He has forbidden] that you associate with Allah in His divinity that for which He has sent down no sanction; and that you ascribe to Allah things of which you have no sure knowledge that they are from Him.’

Any movie or its part which you feel falls under the category of any of these five will be a Haram act, the rest is allowed.