[GAMEPLAY] Jarvan IV bugs.
There's a strange interaction between Jarvan's knock up and Rengar's leap. If timed correctly Rengar can leap through the knock up path without getting knocked up, this is clearly not intentional, since Jarvan's knock up doesn't have the same interaction with other leaps (ex: Kha Zix, Tristana) This bug is easily reproducible, and I've witnessed it in game several times.
Another bug with Jarvan's E-Q combo, is the interaction with walls. If your flag is placed on the left side of a wall, you can get stuck in between the flag and the wall, I haven't been able to reproduce this on the other side of the flag, but I imagine it is possible.