umm i dunno if this really counts as a glitch but if you hit the arrow keys during an ad the ad will start to float to the top of the screen
another glitch i found is
if you have montycarlo's pistol equiped then talk to the druggie and then take it off while talking to him exiting out of the store then talking back to the druggie it shows you are holding a blue montycarlo pistol though ur cahracter has nothing in his hands once you exit the shop
you still have nothing in your hands and can shoot bullets and such like this outa ur hands its neat
when you do the no gun glitch and use fire burner it looks like you are blowing fire out of your mouth
i had a full inventory of equips that i got from monster drops then i unequipped my montycarlo's awesome pistol and it dissapered...
mmy username is ld749 in the game