Howdy, guys \o
Those bugs are not much of a issue, since they are not related to the overall gameplay, but still....
The 1st one's related to world map shops. Sometimes a blank item will pop up on the shop screen (specially on Dragon's maze). The item price is always at 93 crowns, but there's no button to buy it, and no image or item description.
The 2nd is related to the winning screen. When your hero backpack's full, and there's some quest related item (like que couatl), the usual "you have no space in inventory" message will pop up, but when you choose to drop some item so you can take the quest one, the first screen wont disappear, so it's impossible to remove any excess item and take the quest one. I didn't take a screenshot, just remembered about it now. Sorry :/