I completed the final episode with some of my choices mixed up (game thought I took the food when I didn't) and with the DLC coming soon I want to set things right. However, it doesn't seem that rewinding my save file is going to fix things since I tried doing that before and it didn't work.

I also have an achievement glitch where all the achievement for Episode 4 didn't unlock, but the game thinks they did. I don't want that problem to affect my save file.

What do I need to do to make sure everything is good with the 360 version of the game? I've seen some people say they deleted the game and all of the DLC and then downloaded everything again and that seemed to work. Other talked about deleted their profile and then recovering their gamertag to get stuff working.

What do I need to do?

Someone must have run into the same type of problem. Everyone was talking about choices not carrying over correctly. How was the problem solved for sure or was it never solved?

This is a problem that, to my knowledge, was never resolved.

I have a feeling the save file will have very little impact on the next game. Sure a character might cameo here or there if they lived. A few throw-away lines of dialogue, but i doubt anything major.

Basically this. This is a collection of new stories around something that doesn't really involve the previous tale. There might be a couple references, but I doubt it'd take away from the experience at all. Not that replaying is a terrible idea, I've done two playtrhoughs. Up to you.

It would also get my save file set for season 2. If it was never fixed I guess I should just delete the game and all the DLC and then download everything again. Maybe that will fix it.

I don't think that the save file will matter that much for Season 2, either. It's guaranteed to be an almost entirely new cast and any references made to the first season will probably be vague enough that they won't need to make different permutations based on save files.

@golguin: Unless there's something small that I missed nothing from my season 1 save seemed to affect 400 days.