A sign in the town of Salvation says "Kubert's Barber Shop". Joe Kubert was an iconic artist for DC Comics best known for his work on Hawkman among others.
The title "The Magnificent Eight" is a play on title of the iconic The Magnificent Seven (1960) film.
It is revealed that Rip named his son Jonas in honor of Jonah Hex.
Rip Hunter uses the phrase, "What's past is prologue." He is quoting Prospero from the play The Tempest written by Shakespeare.