Okay, its really hard to find a good example of what I'm seeing since most people in walkthrough videos run around very erratically. I did find a couple examples, though. Let me know your thoughts. Maybe its just me seeing what I want to see.
Set the video at 720p if you can to see it easier and fast forward to 1:00. Look closely at the collar when he walks out.
http://www.youtube.com/watch?v=7hmIvWQtX_Y
Here's another example. Same as before set at 720p if you can. Fast forward to 5:30 and watch for about 30 seconds and watch the collar. Sorry about the language in this one.
http://www.youtube.com/watch?v=PVJY8vhGJ1Y
I hope I'm not just seeing things.