According to an interview with Veronica Cartwright, she left the series because the producers wanted to have her character of Jemima Boone involved in more mature situations, such as budding romantic relationships. Patricia Blair did not like this because it made her feel too old, so she threatened to leave the series if Cartwright was not let go from the series.
Israel Boone was one of seventy-two killed at the Battle of Blue Licks, one of the last battles of the Revolutionary War, on August 19, 1782. He was twenty-three. 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.
Israel Boone was portrayed as being the third child, with two older sisters, Jemima being older than Israel. Actually, the Boones had ten children as follows: James Boone (1757-1773), Israel Boone (1759-1782), Susannah Boone (1760-1800), Jemima Boone (1762-1834), Levina Boone (1766-1802), Rebecca Boone (1768-1805), Daniel Morgan Boone (1769-1839), Jesse Bryan Boone (1773-1820), William Boone (1775-1775), and Nathan Boone (1780-1857).