Al tells Sam that one of Sam's six doctorates is in ancient languages. The others known at this point are medicine and quantum physics. However, one of them is not psychiatry.
Sam and Donna Eleese were to be married on June 5, 1984 but Donna left him at the altar.
The #1 Rule is "The time traveler shall not take advantage of his position to improve or alter his life".
This episode takes place in Marion, Ohio from June 15 to June 17, 1972 and in Washington, D.C. on June 17, 1972.
The long ride with Donna Eleese (Teri Hatcher,) The Stylistics song "Betcha By Golly, Wow." Given the passage "..you're the one that I've been waiting for - forever" and Title "Star-Crossed", viewers get a subtle reminder of how important Donna is to Sam.