Bug: I always thought I just imagined things back in the day when coming out of the hallway's window door I saw a statue randomly flying across the screen. I was never able to replicate the bug, but it turns out it actually is a legitimate bug with an explanation (it was supposed to be an airplane Easter egg, but the code fetches the wrong item). Longer explanation and even a fix in the video.
Factual error: Examine the axe (not the armor, the axe) in the hallway. The description says it was crafted by Doge Guiseppe Minelli. Besides the fact that there has never been a doge by that name or family (and he probably wouldn't be making his own weapons), "Guiseppe" is a misspelling of the Italian name Giuseppe. The text mentions also "Antonio Fermaccelli the bologna merchant." Bologna should be capitalized, being a city, unless we're talking about an aristocrat who sold baloney, who wouldn't be called that way in the XIV century anyway. Finally, "Fermaccelli" is not a legit Italian last name.