there's like 10 of them, riot just refuses.
Tornado stuffy cd
Ult attack block for .5-.75 sec
w not blocking projectiles like tf enhanced auto from e if he uses wall as tf throws it
W not blocking zeds shadow (which is a bug, and it always will be, there is no reasoning behind it not being, it used to block, no notification of a change, and its a projectile (like ori q, should be stopped on wall, not pass and not destroyed)
eq combo sometimes does stops movement **and ** attacks for .5 sec
eq combo doesn't do damage to enemies hit in the outer 15 units of the attack if he has tornado on the spin
tornado wont knock up enemies if they are within 50 units of the cast animation (which they should)
Project Yasuo has ~5% delay on his animations compared to his other skins
Rarely (1/10000) he cannot dash if he was charmed in the exact middle of a full dash length until he autoattacks
And im pretty sure if he is stunned or knocked up mid q it is supposed to refund the cd, not put on full dc with no damage. It used to anyway