Allright, i watched a little more of it last night, and have to add a few more things. For a guy that claimed to be a bear expert, he sure didn't read bears very well.
In several scenes, you can see the bears laying their ears back on their heads. This is an obvious sign of anger and annoyance.
In another scene, you can see the bear rocking back and forth, which Tim assumed was a comforting thing for the bear, when, in fact, it is a sign of extreme anxiety and annoyance.
Tim was no expert. He made it through 13 years not because he was good with the bears, but because the bears were exceptionally tolerant of his crap. I credit the bears with his long survival, not the man.
Oh, by the way, I know very little about Grizzly bears. I've only ever seen one in the wild (near Calispell Lake in Northeastern Washington) and it was running away from me FAST, so I only got to see it for a few seconds before it was gone. I see black bears all the time, but they are a totally different animal in almost every way... That is the extent of my experience. Yet somehow, it appears that I know more about them than this guy that spent 13 years studying them...