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Ascended Fanon: The series initially didn't have an official title, but was referred to by everyone as "the Alex Rider books". The 2010 rebranding has officially adopted "Alex Rider" as the series title.
Contest Winner Cameo: Ark Angel and Scorpia Rising both featured gadgets designed by competition winners (the sleeping-gas-exhaling/exploding inhaler and the Hat Nav, which never actually got used).
Teasing Creator: Anthony Horowitz has indulged in this on creation; he teased two plot points from Scorpia Rising, namely that one of the villains in a previous book didn't really die and that Smithers had a big secret, before Crocodile Tears was even written.