On Android, if you save your game while having an encounter, some textures, like X button, get black, and if you press it, the game crashes with error. Though it's not bad as you can just Continue or load save you made.
Another issue seems to he Dullahan head date in Town of Monsters. It only triggers if you travel on carriage to the town and enter something. If you travel on foot, it's impossible to find this event in the same circumstances.
Also I confirm what the person above said. Sometimes Mossy Expanse is generating buggy next to Outpost. It may be unreachable because there are no nodes that lead to it. Or it may be not possible to reach some character like Dark Knight. Seems to happen specifically in this area of location.