Several copies of "The Autobiography of Malcolm X" are shown in the JFK Airport gift shop with Al Freeman Jr.'s image in place of that of Malcolm X. However, when Simon reads the dedication to him that Alex has just written on one copy, the real Malcolm X's photograph is on the front cover.
Elizabeth Harvey is listed as three on the 1870 census, which would mean that she was born in 1867. However, her age was given as 18 years old in 1882 in Part I (1882-1883) (1979), meaning that she would have been born in 1864.
When he first meets Odile at Dodie Brattle's party, Alex says that he has been asked several times what he thinks of Thurgood Marshall being appointed to the Supreme Court. This scene takes at some point before the 1964 Republican National Convention. However, Marshall was not nominated for appointment to the Supreme Court until June 13, 1967 and not confirmed by the Senate until August 30 of that year.