AGS: The Excavation of Hob's Barrow: Small graphical priority errors

[tag2015]

There are a few graphical priority errors in the game, that should be cross-checked with the upstream interpreter.

• When talking with Mr Briden, his sprite does not appear in front of his house door. The hotspot works normally.
• When entering the barrow, you crawl through the hill but the dig is not shown.
• Near the end of the game, there's a puzzle with stones reminiscent of those in Indy 4. In some configurations the biggest stone disappears (this does not prevent the puzzle from being solved)

I opened this bugreport so I won't forget about these, but if anybody is interested I can also attach some saves.