At the auditions for Agito. One of the finalists of the title role was Yuusuke Kousaka. He's the son of Ryo Hayami, AKA, Kamen Rider X. Toei had a policy for main actors family members not to be involved in front of the camera in a key role, possibly to avoid cases of nepotism. Eventually, his family history was unearthed and Kousaka was disqualified from from the auditions.
Agito is the first Kamen Rider series to feature the three main types of Riders: a mystical Rider (one that draws power from ancient technology or mystical methods), an organic Rider (one whose anatomy changes to become a Rider), and a high-technology Rider (one who is either a cyborg or uses advanced technology to fight).
The word "Agito" is Latin for "keep going", "move", fitting the theme of endless evolution of the titular Kamen Rider and the show itself.
This is the last series that is associated with Nippon Music Group. From Kamen Rider Ryuki onwards, Avex Entertaiment became the new music label for Kamen Rider Series.
This is the last series where the Kamen Riders transform using the traditional Ishinomori style henshin belt, as future installments would use the modular "Rider System" type.