- His audition tape for the role of Elvis Presley in Elvis (2022), he sang an emotional performance of "Unchained Melody". Director Baz Luhrmann was so moved and impressed with his audition that he gave the role to Austin.
- He plays guitar and piano.
- Was in a relationship with High School Musical actress Vanessa Hudgens [2011-2019].
- His maternal great-grandmother was the daughter of Finnish parents, from Saukonkylä, Alajärvi and Utajärvi, respectively. Austin's other roots are English, as well as Scots-Irish/Northern Irish, German, Scottish, Welsh, and distant Swiss-German and Swedish.
- He was approached by a representative from a background-acting management company, who helped him get started in the entertainment industry in 2005.
- Was invited to join the actor's branch of the Academy of Motion Picture Arts & Sciences in 2023.
- Portrays Manson family member and Sharon Tate's murderer Tex Watson in Once Upon a Time in... Hollywood (2019), and Elvis Presley right next in Elvis (2022) - which depicts the King's shock and anxieties related to his safety following the brutal murder of Tate.
- His friend, Lindsey Shaw, introduced him to her manager, who offered to represent him, starting from that day till now he is being represented by the same manager.
- Butler made his Broadway debut in the 2018 revival of The Iceman Cometh.
- He was the ring bearer at Alexa PenaVega and Sean Covel's wedding.
- He has appeared in three films that have been nominated for the Best Picture Oscar: Once Upon a Time in... Hollywood (2019), Elvis (2022) and Dune: Part Two (2024).
- His older sister, Ashley, got to do some background acting with him in Ned's Declassified School Survival Guide (2004).
- Longtime acting mentor is Larry Moss.
- In a 2012 Teen Vogue video, he wanted to be the first American actor to play James Bond but years later in a 2025 Vanity Fair Lie Detector video that it's not a good idea for him and did stated that Idris Elba in the role.
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