Mac, as far as that crazy crab is concerned, let me quote Laura:
"maybe if you ate something that is claimed by Mom's everywhere to make their kids run around like crazed rabbits - you would be fast enough to catch the crab. It is something you should have picked up at the grocers in the back room."
There is a five page thread here
, which is as close to a walkthrough as I can find at the moment. There were hints on the home page for Aftershocked, but right now I can't access the site.