* NamesTheSame: Naoya Kaidou shares a family name with [[{{Tsundere}} Kaoru Kaidou]] from ''Manga/ThePrinceOfTennis'' - who, funnilly enough, has the nickname "Mamushi" (Viper) whereas ''Faiz'''s Kaidou is the Snake Orphenoch.
* WhatCouldHaveBeen: There are few elements that never made it to final production. Like [[http://images.wikia.com/kamenrider/images/6/6f/Rejectfaiz.jpg three unused riders]].