Whether or not he was putting on a show, there's something I haven't seen mentioned here, and it's the circumstances of the tazing.
He was in the library, they asked him to show his ID, he didn't have it, so they asked him to leave. He was on his way out walking to the door, the campus cops intercepted him and grabbed his arm. He said "Let go of my arm" and shrugged them off (still walking to the exit) and then they tazed him.
Is it appropriate to electroshock people who are complying with the order to leave?
Second, when watching the video, at one point a student asks one of the officers for his badge number, and the officer threatens to taze him if he doesn't leave. It's inappropriate for a police officer to threaten someone with physical harm for asking for a badge number, in fact I think that it's technically considered a form of assault.
Whether or not he's putting on a show or not (Like Michael J Fox was putting on a show?) the fact is that he was tazed while complying and that the officer threatened someone for making a legal request.