Yes, as you probably know far better that I do, many sticky situations on Malcolm are left up the air, so we never got to know how they recovered from all those injuries you mentioned or how they got rescued or off the hook.
That's due to the episodic and comic nature of the show I guess, where a lot of things aren't developed from one chapter to the next logically.
Sometimes I think this is a pity, but I've recently been watching one comedy which spent a number of episodes developing one particular situation all lead characters got stuck in, and this really got tedious, even though the acting was fine and there were many well-written lines.
Rich