Blu ray flicker Why more and less?

[TheWildWhelk]

This isn't a thread about the 'pan judder' of something similar, but one asking those of a technical mind why some Blu Ray films have more 1080p-to-1080i flicker than others. Example: Rambo III has very little flicker, but 300 is the worst offender, looking horrendous (coupled with the film grain, it's almost unwatchable.)

The television i have is a 37 inch LG 37LC55, a stand-out HD Ready set, with a 5000:1 contrast ratio etc.

Any help would be appreciated!