I think there might be a misinterpretation of the discussions Harvey and Raph have had about "breaking the game".
Dishonored has very systemic gameplay that allows players to tackle scenarios in ways that weren't anticipated by the team at Arkane. Because of the ways systems work, a player can http://www.youtube.com/watch?v=tZCA6DvtCkY&feature=player_detailpage#t=762s to avoid be killed. This is the sort of thing they're talking about when they said they want to see players "break the game." To that end many of things we show in the Creative Kills video are ways you can break it through the systems presented. This http://www.youtube.com/watch?v=JZDYq6HufNs&feature=player_detailpage#t=176s is another goood example.
If you go through the article again, the only thing that could be conceived as an actual glitch is this one.
Can I… ride away on the boat with creepyweird psycho man and Lady Boyle? — Nope. I hopped aboard while creepyweird was talking at me (honestly, my ability to do so may have been a glitch) and prepared myself for a glamorous life of sea conquest in a tiny, two-person boat. Then, as the boat began to drift away, I ran face-first into an invisible wall.
That's not something intended for players because you wouldn't be able to finish the mission if you left the area and decided become apart of their love triangle

Can I… possess Lady Boyle instead of knocking her out? — Yes. Instead of even talking to her, I just walked her to creepyweird myself.
Something like this is absolutely intended. We want players to find ways clever ways to "break" the game.
Hope that clears things up.