? Extra Stuff on Pirates 1 Disc 1

Hi,

This isn’t technically a copying question, but does anyone know what the deal is with the Pirates of the Caribbean: Curse of the Black Pearl DVD? Title 1 is the main movie at 2:23:02, but then there’s a whole bunch of extra titles that seem to be chunks of the main title (adding them doesn’t increase the required size if copying.) I think they may be weird ways of adding commentary. Title 3 is 1:15:01 and looks almost like some kind of “tv version” or something.

I tried finding details about the DVD, but everything I find is just a rehash of what’s written in the features section on the back of the box.

I only want to watch the movie itself, so is title 1 the only important thing on that disc?