I have encountered a graphical bug when using Quinn's Phoenix skin. Firstly, Valor doesn't stand correctly on Quinn's arm when performing the Joke emote or while recalling. He just stands in the air. Not only that, but in the skin Valor is red and while performing the Joke emote, Valor is blue as if he had no skin.
There also are missing sounds when using some of the abilities. But I'd assume they are still missing.
Lastly, she appears to have no portrait in the lobby.
This last bug is a game bug with bots. While I was playing Quinn in Summoner's Rift, when I destroyed the second top turret, my gold went negative. Like this: -2458624676913... The number might have been longer.
While playing in this match, a Leona bot recalled and bought Frozen Heart, Aegis of the Legion and Zeke's Herald. The total cost sums up to about 8000 gold. This happened at minute 7.