I don't know why he got the penalty, but I was watching a video of the incident and there's a really funny exchange between Franzen and the Ref. The video is here:
The Ref is leading him off at :40 and for some reason he keeps patting Franzen's butt. You can see Franzen get really annoyed at :50. Maybe he just didn't like being led off, but it looks to me like he just doesn't like butt pats as much as BottleofSmoke.
Did Franzen try to give the ref a high five? Haha.