True to his nature, Sheldon doesn't just read the books for fun; he becomes obsessed with finding internal inconsistencies. He famously points out timeline errors regarding the building of Barad-dûr and the visible phase of the moon.
However, I couldn't find any information on a BDRip version of this episode being a "long feature". BDRip is a video quality format, and it's possible that you're referring to an extended or special version of the episode. young sheldon s03e04 bdrip
