Finding the pieces of glass at end

I can only find 7 of them. I have looked at the hints and have gone back to all the places with no luck. Are the stables at the windmill and which cart do they mean? Thanks

Hey! Just played the games today and saw your post. I had the same toruble but if you click on the skull mixing bowl on the fortune tellers table in the wagon the 8th piece of glass is there. Hope it wasn't to late!