In the last episode of season 2, Kevin's face and shirt and splattered in blood. In the flashback of the season 3 opener, they aren't there.
On main Bloodline List when looking at Season 3 - Part 24 - Kevin is looking over Marco's body after he just smashed in Marco's head. In the actual episode Kevin's shirt is almost completely covered in blood. But in this excerpt, he only has a few drops on his shirt.