In the closeup of the bar code tattoo one can clearly see that it is made of a halftone printing pattern. A real tattoo would not exhibit such a pattern, especially not for a bar code, which only consists of fully black and fully white "pixels".
Michael has a gray car ready in a parking lot which he uses to fake his and his brother's death. There, he has chunks of pig meat he uses to fake B negative blood, his and Linc's blood type. But, the car has been in the parking lot where Michael had left it before he went to prison, that was at least a month before. In one month, the pig meat would have rotted in the car.