Apparently Some Guy said his game would keep freezing at a certain spot, and his disc had two smudged fingerprints on it. He Cleaned It And The Bug Was Fixed. I Guess The Disc Is Very Sensitive. If you're the type of person who touches the back of the disc when picking it up... the don't do that, and Clean the disc properly. Also for the downloaded version of The Last of Us, I heard that people who had problems just kept deleting the game and re-downloading it eventually made it work, so my guess is that the download can sometimes be corrupted. Here is the thread from the forum I Got This Info From: http://community.us.playstation.com/t5/Technical-Q
People who have bugs and have a disc version, please clean your disc and see if it is fixed, then post on this thread to tell if it helped or not! Also, I Think the downloadable version MIGHT be Buged, But I'm just speculating so don't flip out at me if I'm Wrong.