So! I just started playing Skyrim on the PS3, and I've noticed some strange glitches when it comes to certain dialogues in the game. Sometimes, for some reason, they just don't happen. :/

For example, when you first get out of Helgen and follow Ralof or Hadvar to Riverwood, they completely bypass the Warrior, Mage and Thief stones. In fact, they don't even go near them, instead they cut through a trail that runs in front of a cave and back to the main road. Next one I noticed was when entering Whiterun, the Alki'r warriors you run into for the quest 'In My Time of Need' are standing there, but the brief dialogue that is meant to take place between them and the guard does not occur. You can still talk to them and get the quest, but before that they are just standing there silently. The third, and most important one I've noticed happens right after you kill your first dragon at the watchtower. After you absorb the dragons soul and everyone gathers around you, no dialogue occurs. No talk at all about you being Dragonborn! Yet if you talk to them, they act as though the dialogue took place.

Has anyone else experienced something like this and possibly know of a way to fix it? I bought the game used, and the disk is in perfect condition, so I'm kind of wondering if there's something wrong with the hardcopy of the game itself? I'm trying to decided if I should return it and get a different copy. Don't really wanna go through the game missing out on important cut scenes. D:

I gots the original PS3 and the game is Legendary Edition that comes with Dawnguard, Hearthfire and Dragonborn DLC. Latest updates installed.

Thanks in advance!