I did notice a small bug where it's possible for your character to stand on top of the sign outside of Sweetwater. Though the only way to pull this off is by dismounting your horse next to the sign.
Thankfully, it's possible for the character to move off of the sign. Though, if it wasn't for the horse whistle I would've then found it impossible to remount my horse. Since, I would have had to approach it from a direction that would be impossible to access.
Though, it may be worth testing this feature around other objects.