[4] Reilly O'Brien made his debut in the 138-point win against the Brisbane Lions in round 20, 2016 at the Adelaide Oval.

[5] He didn't play much football between 2016 and 2019, but broke into the side after Sam Jacobs sustained an injury.

[7] O'Brien faced controversy when he accidentally tweeted that West Coast ruckman Nic Naitanui is "lazy and unfit", attributing the mistake to a broken smartphone.

[10] Part-way through 2024, the struggling Crows chose to drop O'Brien to the SANFL in favour of Kieran Strachan in an attempt to revive the club's season.

He has since undertaken post graduate study, both in business administration and public health through Torrens University.