In the scene when Selene is driving with Michael after he is bitten and after she has been stabbed as they are driving towards Lucian to hit him, look at Michael. His hair is longer and a bit more poofy. The passenger who is SUPPOSED to be Michael looks like Selene. Yes, his hair could be a bit more dry, but in the next scene and the previous one, his hair is wet and slicked down on his head completely.