Prayers don't drain points
Cooking can get glitched from bank in catherby, allowing cooking from 80 to 99 take 15 seconds
Insane thieving rewards (99 thieving)
300k xp per log while training firemaking
Fishing wont let you stop until inventory is full, even if you tele away
Farming wont give you herbs, just xp for spamclicking seeds on the patch
Ores don't require coal to smelt them into bars

Also I have som suggestions:

Nerf stores and starter items, also most skills have insane xp rates, which needs a nerf.