^ I include stylized titles as part of my "not always possible" comment. I was going to mention that but didn't. In some of those instances, the colon is the issue once again, though it's sometimes obvious when one is present, like with Fantastic Four: Rise of the Silver Surfer
and when one isn't present, like with Batman Forever
As for movies with different titles, I don't know. If it's clear that a title was updated, like with Star Wars for example, I'd go with the update.