In an interview, Veronica Cartwright said she left the series because the producers wanted her character involved in more mature situations, such as budding romantic relationships. Patricia Blair didn''t like that because it made her feel too old, so she threatened to leave the series if Cartwright wasn't removed.
Israel Boone was portrayed as the third child, with two older sisters. In real life, the Boones had ten children: James (1757-1773), Israel (1759-1782), Susannah (1760-1800), Jemima (1762-1834), Levina (1766-1802), Rebecca (1768-1805), Daniel Morgan (1769-1839), Jesse Bryan (1773-1820), William (1775-1775), and Nathan (1780-1857).
Mingo was Oxford educated. His father was English, and his mother was Cherokee.
Fess Parker portrayed Daniel Boone wearing a coonskin cap, a carryover from his portrayal of Davy Crockett. In actuality, Daniel Boone wore a beaver hat with flat brim.
Israel Boone was one of 72 killed at the Battle of Blue Licks, one of the last battles of the Revolutionary War, on August 19, 1782. He was 23. His father, Daniel, was there and saw his son killed. Coincidentally, Darby Hinton, who played Israel, was born on the 175th Anniversary of Israel's death, August 19, 1957.