To get scuzzlebutt get the pot pie at easter it is by the lake.
To get the skins special cheat option collect the 3 pot pies at easter (on the top of the 2 towers and down the hidden tunnel.
To obtain Bebe on cow days avoid collecting the antidote at all while your player is cartman.
To get visitor collect the two golden cows at memorial day.
To get ms broflovski collect the golden cow on top of the hospital at easter.
To get grandpa complete thanksgiving in 1st place.
To obtain Damien by bering the only person to hold the key on new years eve.
To get Big Gay Al beat him at pink lemonade.
To get Miss Cartman don't let any one else pass over a check point on the pink lemonade race