1. In some versions (in particular, if you download the .exe file from here: /attachments/7503/>), it is impossible to hire monsters for gold. Instead of displaying the corresponding window, the game crashes.
I remembered this because I accidentally deleted my .exe file. Maybe it's not worth dealing with this issue.
2. It should be prohibited to enter artifact merchants during an opponent's turn. Currently, you can view your opponent's finances there, buy artifacts using their money, and even switch to the market and transfer all of your opponent's money to yourself :-). However, after passing the turn, all the effect disappears, which is a pity...