Yeah, one can make the argument all day about whether or not it was interference. I have seen some analysts make the argument that from Kronwall's perspective he assumed that Havlat was going to play the puck by the time he got to him (Havlat did make a movement toward puck with stick and missed as it went off boards) and by the time Kronwall was in motion it was too late to change. And I also have seen arguments that he knew Havlat didn't play the puck.
Regardless of the interference implications, the hit was clean as far as the NHL rulebook is concerned. At the time of impact elbow was down, feet were planted on the ice and it was a clean shoulder hit. His feet did leave the ice following impact with Havlat, but that is according to rulebook that is allowed.
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