I'm not usually one to back track a FREE ROAM game, but the first "area" of the game, theres a Once the is gone, can we return and loot the fallen? Just a thought. Free loot, you know?
I have yet to see anyone do this...I wouldn't have either, but now that I think about it...

stuff probably vanishes by then. Probably repopulated with something else to fight

No reason why we wouldn't be able to return.

btw, I lol'd at your spoiler tags

It doesn't seem to have a fast-travel marker but why not.

Hey, alot of people are getting shot right out of the sky(Sky-rim, lol) these days. I wanna be careful.

Yeah, I think they forget that this is a spoiler only sub-forum.....

Oh but if you mean going back through the cave, no. It collapses in multiple spots from the dragon attack.
You can fast-travel back to Helgen though.

Ah, I see. To Helgen, then! I"M OFF!
*Horse-Nay! Clip, clop, clip, clop*

About cave I dunno, but you can return to the town itself, but it's deserted.

Actually, for clarities sake, it's not a 'spoiler only sub-forum' at all.

To answer the OP, I believe we can return to Helgen post-tutorial dungeon but I'll be surprised if the guards killed by the Dragon are still there.

Is there loot?