Quinn E bug - fully reproducable.
EDIT: Because someone said this, none of these are my videos, I just took them from other people. Quinn's E will occasionally bug out weirdly and throw her in random directions. Video full of examples: https://www.youtube.com/watch?v=9lYfo0s4e0o
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If it bugs out, Quinn will always vault to the right from her perspective of the angle she comes in.
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Quinn's vault will glitch if she follows a dash which causes Quinn to "curve" during her ult, under certain conditions.
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Quinn's vault will glitch if she follows a dash which is significantly longer than her vault range. This was primarily tested with Tristana.
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Quinn's vault will always glitch in the following reproducable scenario: http://imgur.com/AVF6SS3 The terrain needs to be significantly thick for this to work. The reason this works is due to the terrain extending the dash distance, ex. Ezreal E.
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A 100% reproducable scenario is if Quinn stands at a 90 degree angle to the jump direction of Tristana, and Tristana completes her jump at max range (isn't interrupted). If the jump is interrupted, it won't glitch.
We were unable to find explanations for some of the wonky parts in the video, but this bug covers many of them. Flash is also weird with vault, but we couldn't test due to flash's longass cd (sandbox pls).
Other notable Quinn bugs:
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Harrier mark will stay on a champion but be unable to be proced if the target goes untargetable while the Harrier auto is mid-flight. Ex: https://www.youtube.com/watch?v=qEda3IaaErw
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Blind sometimes just...doesn't work. https://www.youtube.com/watch?v=D0nm0QvHJsg This is most common against things like Vayne Q, Jax Empower.
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E sometimes goes wonky and leaves you in the face of the enemy. Also have had Valor E act like Quinn's E. https://www.youtube.com/watch?v=9jGBMtfknWc
Pls fix our bird. 
still lands the knock up
Q nails you for damage and silence
Will get you caned
will still flip you
will stun you
see Singed
same as Garen, minus the silence.