If you have played to say, lvl 15, and decide you want to play level 7 again, YOU CAN'T GO BACK TO LVL 15, YOUR NOW BACK AT LVL 7!!! How stupid is that?!
The problem with these kinds of games is that the further into the game you get, the longer you have to wait to actually get any money. I don't want to wait for 10 minutes for my guy to land only to have to do it again right after.
If you jump out of the window while the claw is holding out you from the future, there will be two of him: One being held by a claw through the window, and one being held by the escaping crab.