- According to a 2004 contest held by ABC Family, Austin's character Jason Lee Scott was voted as the greatest Red Ranger of all time.
- Spent time saving lives in Washington D.C. and Virginia as a Paramedic on the East Coast.
- Speaks four languages: English, Spanish, Italian and Korean.
- According to a 2007 Red Ranger contest on Toon Disney, Jason was voted the most popular Red Ranger of all.
- Was the youngest cast member during his time on Mighty Morphin Power Rangers (1993).
- Worked in the Middle East as a medic and worked alongside the United States military in Iraq and Kuwait. He was not, however, actually in the military himself. His father and brother were both Marines.
- Previously rumored to be returning to Power Rangers DinoThunder (2004) as the Black Ranger. Also, his character, Jason would be the estranged father of the character Sky Tate who died in battle for Power Rangers S.P.D. (2005), as well as returning to Power Rangers Operation Overdrive (2007) as the mentor. All these other rumors proved to be false.
- He along with Walter Jones and Thuy Trang, quit the show midway in Mighty Morphin Power Rangers (1993) during Season 2, because the three actors needed an increase in their salaries. They were originally cast for the Mighty Morphin Power Rangers (1995) film, but were later replaced following their dismissal from their contracts.
- He is of Native American, German, Irish, Japanese and Spanish descent.
- Has a 2nd degree black belt in Taekwondo as well as black belts in Judo and Kenpo.
- Was originally supposed to be in Mighty Morphin Power Rangers (1995) but due to a contract dispute with Haim Saban he left the show and was later replaced by Steve Cardenas.
- Graduated from Sunny Hills High School in Fullerton, California.
- He auditioned for Mighty Morphin Power Rangers (1993) on a dare from a friend.
- Was previously a Christian denomination before converting to Catholicism in 2010 by the time he began working in the Middle East.
- Director Kevin Smith gave St. John a shout-out in "Jay and Silent Bob Reboot (2019)" when Joe Manganiello's character Bailiff says "Oh, man. You ever see the one where the red ranger turns into the gold ranger?" referring to St. John's character from "Mighty Morphin' Power Rangers (TV Series)" to "Power Rangers Zeo (TV Series).".
- When it comes to politics, St. John has described himself as "probably a third party folk." In a 1995 interview with Los Angeles Times, St. John said he supported Republican policies on tax cuts and foreign aid, while also supporting Democratic positions on crime prevention, aid for college students and opposing spending on "Star Wars" weapon systems.
- St. John is a fan of both the Dallas Cowboys and the San Francisco 49ers.
- No relation to fellow actress and "Bond Girl" Jill St. John, despite a popular misconception.
- St. John's all-time one rep max on Bench Press is 465 lbs.
- St. John's all-time one rep max on Linear Leg Press is 1,100 lbs.
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