- Speaks fluent Japanese.
- He has a twin brother, Daniel, 3 other brothers and an oldest sister.
- Spent two years in Japan on the traditional proselytizing mission for The Church of Jesus Christ of Latter-day Saints.
- Jon and his wife, Kirsten, met at Brigham Young University.
- Attends Brigham Young University in Provo, Utah. (2004)
- Is a computer animator and majored in 3D animation at Brigham Young University.
- He is heavily into 1970s clothes, music, etc.
- Has daughter Evan Jane, born on April 6, 2007, and two sons, Philip and Timothy with wife Kirsten.
- When he was Punk'd (2003), his twin brother, Daniel Heder and close friend Darrin E. Lile were the accomplices.
- He is a graduate of South Salem High School, Salem, Oregon.
- Loves Futurama (1999) and Led Zeppelin.
- Until the release of Just Like Heaven (2005), an urban legend stated that he had died shortly after the filming of Napoleon Dynamite (2004).
- He has Swedish, Danish, English, German, Scottish, and Dutch ancestry.
- His father Jim is the older brother of WCAU sportscaster Vai Sikahema's wife, Keala.
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