During a recent replay of Quest of Magic I discovered some peculiar glitches, as well as a couple of secrets I'd completely forgotten about.
If you're a human, the Orc Champion's name is changed to Orc War Hero when it speaks for some reason, but only on certain cards. Similarly, one of the Drow variants says something along the lines of "Is this what the surface sends to recover the amulet? A mere human/elf/dwarf? Bah, what mockery!". In the early days of development, the artifact was in fact an amulet that would allow the Underdark dwellers to survive in the sunlight, but it was later changed to a sword with no elaboration as to its powers. I mustn't have updated the Drow's speech dialogue.
As for secrets, did you know that there's actually two secret rooms in the imp dungeon? The second one is hidden behind the wall opposite the ladder leading down to the stone dungeon, so you'll have to take the ladder back up again to reach it. Furthermore, typing "RS" in front of the cheat tree gives you the Roguesoft Sword and Divine Lamellar armor. I don't even remember adding that one.
EDIT:
Oh yeah, how many of you found the treasure chest that washes ashore near Lanburgh?