Board Thread:General Discussion/@comment-26006155-20200107155350/@comment-26006155-20200209130420

I was going to propose, for a moment, that Sans knowing exactly where Frisk would teleport to during the Megalovania fight could also be explained by Sans remember the fight and using that knowledge to anticipate Frisk's movements.. but that doesn't work because that's in place the first time you fight him, and doesn't observably change.

Sans knows all about timelines and Saving and Load, and his absurb power level compared to King Asgore leaves few explaination other than him being a human, uncannily like Frisk.

But I have yet to find anything ironclad about Sans remembering things between runs.