After 40 attempts to download patch 1.05 which kept switching my playstation down i finally did it and about 5 mins into the game after the car crashs the whole game glitched out,no landscape people falling though the floor etc etc,ive had a look around and people recommend changing my hdd? I know this is probably old news but any help would be appreciated.
From the XMB menu try deleting all of the files accociated with The Last of Us from the Game Data Utility. From memory there should be 3 (including the latest patch). This won't lose your game progress but you will have to attempt to download the patch again.
If this doesn't work also try deleting the save data in Save Data Utility. This will lose your progress but you can always back up these saves so that incase they aren't the problem you can restore them.
This has fixed broken and glitching games before for me.