The black car is not a "new" car…he's always had it. The brown car is a temporary car he was using to trail Tio, presumably to avoid any detection while he was following them around and potentially killing them.

Mystery Man (Gus) had trackers both in Mike's regular car (black one) and his stealth car (brown one), presumably b/c he wants to know what Mike is up to and Mike uses both cars. Mike abandoned the stealth car at the junk yard, but not before he figured out how he was tracked. When he gets home, he checks his regular…

I think this episode definitively answered the question of Ziggy's father. There was an interesting scene where Jane and Celeste were Skyping. Why were they Skyping vs. texting or talking on the phone like every other conversation? I think it was deliberate foreshadowing. During their video chat, you see the dinner…