2) According to ancient sailors' superstitions, women are nothing but bad luck in the ship. Thus, in order to pay homage to this old tale, Sarah Fortune was named by Riot as Miss Fortune. A pun for the word "misfortune."
3) The Yeti rider Nunu was actually named after the dog of one of Riot's game developers. He also uses that nickname to address his wife.
4) Warwick's Urf the Manatee skin was originally used in 2009's April Fool's Joke with just some minor changes.
5) Urf the Manatee is one of League of Legends most memorable characters that was not even a champion. His character is still retained by Riot and can be seen in Urf Rider Corki and Fisherman Fizz's skins.
6) When the plantlike Zyra killed the zombie Sion she always gains 2 additional golds and vice versa. Obviously, this is a satire to pay tribute to Plants Vs. Zombies.
7) Maokai gives additional movement speed to Zyra when he is nearby.
8) Zyra's character will slightly grow with its plants when she stands next to Leona. Needless to say, the latter's Sunlight skill just makes plants grow faster than the usual.
9) When using Vi against Leona, makes sure to use her taunt skill to lower her sunglasses. Characters with sunglasses usually gets less damage from Leona's Sunlight.
10) Signed can break the crater from Jarvan IV's ultimate skill.
11) One of Jarvan IV's most distinguished quote is "For my father, the king." These words are also spoken by Arthas from Warcraft III.
12) The name Heimerdinger is most likely a pun of the word "humdinger," which means a person or thing with remarkable excellence.