I did hear funny stories about bad controls in the beginning with people stuck on trees because of their cart controls and it took them forever to actually turn around it.
Damn driving that cart. Best to enter cinematic mode and keep x pressed to auto follow the road as otherwise you can either easily get stuck, the wagon suddenly becomes inoperable (mission failed) or the horses mysteriously fall down and die (mission failed). The same happened when I was on the horse, wrong slope, horse falls over, dead. Just hold x to auto follow, safer.
I also already had things suddenly disappear. A bear attack in the snow and after knocking me off my horse suddenly vanished. No trail left in the snow while all the other trails were there.