I’m checking out the Blu-ray of the epic disaster movie 2012 and exploring the special extras (more on this later). One of these is a Bonusview PIP commentary feature. You have to select this specially to play, rather than just switching back and forth within the movie. One unusual feature of this is that while the movie itself has only 16 chapters, the PIP version has 39. Checking a bit more closely, I discover that the chapter markings for the PIP version align with the PIP segments. Jump to a chapter and a couple of seconds later the PIP window will appear and the discussion will start.
This is really good thinking since the PIP content only runs for about about half this version of the movie.