In the mushroom area, I fell onto the map and then the character no longer controlled anymore. I could still call for the map, but the character couldn't move or jump or anything else. I assume the feet were stuck in the platform or something.
Sorry about that :(
This is a really old bug that I could never find the solution to. I think it's some state or animation that breaks at a very specific frame. It can happen with all item pickups, but it seems to be most common with that particular map. To my knowledge it's a frame perfect bug, so it shouldn't happen again if you reload the game (unless you get very unlucky).
I would try to fix it, but the code is really old and really bad and I kinda just don't ever want to touch it again. That should be the only softlock that still exists though, so hopefully you won't experience anything else like this with the rest of your playthrough.