More NPC´S to talk, more quest sides, a fast inventory to select a instument (or weapons like a sling to throw rocks to the enemies) a mini map, hour of the day and UI that shows the day and the year when are you, a health bar that shows your vitality and also you can be heald with food and practical medicine of that time (you can craft it any time while you have the ingredients, I dont now if in the history you would be traveling from the past to the future and vice versa but also be heald with modern medicine that you bring (just if thats the case)