1. 2X poison roll MH 1x poison roll OH on mutilate
this bug caused for mutilate to be able to double procc poisons on the main hand, which turned out to be a huge dps increase for rogues by itself, and you could take it a bit further by putting your fast weapon+deadly poison on your main hand, for you to have more instant poisons proccs in exchange of some mutilate damage, on a 1h sample size i never got a double MH proc from a single mutilate, fast weapon in the mainhand seems to be a dps decrease on Warmane Onyxia, and assassination rogues overall do less damage than they should
2. Roll of poison/trinket on Feint
This is pretty self explanatory, the spell feint had a roll por poisons/trinkets on classic, which made glyph of feint a marginal dps increase if you just cast it, this isnt as meaningful as the first one but its a difference i noticed.