Crystal balls can be used to find which level any of the unique items is currently on. Unspecified how it would show different branches or if this works on items you have never seen (if it did, you could use it to look for the Amulet and figure out how deep the dungeon is).

If you chat to a straw golem, it will say a random strawman argument, e.g. “If the priests give two bits to every beggar, nobody will want to work anymore.” or “The straw golem completely misrepresents your argument.”

Tourists encounter a new shop, a gift shop, on dungeon level 1, possibly built around the entrance stairs. The gift shop stocks mostly useless items like fake Amulets of Yendor, juice and candy bars at high markups, plastic figurines of low-level monsters, and T-shirts (which are much less of a big deal to the Hawaiian-shirt-wearing tourist).

Extrinsic sources of acid resistance should protect your weapon from passive corrosion attacks, and extrinsic sources of fire resistance protect your armor from taking fire damage.