Board Thread:General Discussion/@comment-27907368-20160514064034/@comment-25181180-20160514080322

 sans remembers unSAVEd stuff and knows loading.

This can be seen when trying to obtain his room's key and several points throughout the game.

There seems to be another path that leads into the Underground somewhere else other than the Barrier.

Papyrus mentioned that Undyne found a Skeleton flag at the bay (at least that's what I remembered).