A direct comparison of both performers' primary documentation illustrates how disparate their backgrounds truly are:
| Biographical Category | Diane Keaton | Michael Keaton |
|---|---|---|
| Birth Name | Diane Hall | Michael John Douglas |
| Date of Birth | January 5, 1946 | September 5, 1951 |
| Birthplace | Los Angeles, California | Robinson Township, Pennsylvania |
| Father | Jack Newton Hall | George Alexander Douglas |
| Mother | Dorothy Deanne Keaton | Leona Elizabeth Pawlak |
| Origin of Stage Name | Maternal maiden surname | Arbitrary selection from a directory |
| Primary Ancestry | English, German, Irish | Scottish, Scotch-Irish, Polish |
