Kamen Rider Agito

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.