The Hank thing's been bugging the sh!t outta me too- maybe if we assume there is a couple minutes that we don't see between them getting on the X-1 and it taking off, that would allow for Hank to exit via a secret hatch or cargo doors and sneak to the car? But it looks like one continuos scene. Also just after that when Brock gets knocked down he isn't even in the parking lot, but when he gets up he's right near the car- there have been a few placement issues like that that I have noticed this season- another being Phantomas' position on board the blimp when Mark Twain is talking.
As for the boomerang thing, I dunno- I think maybe he knew it wasn't really gonna hurt too bad and it would make him look tough to his opponent, or maybe he used that smack in the face to get him hyped up into battle mode more?
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