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.
Another sign in Salvation reads "KLEMMER & SONS Mercantile and Provisions". Phil Klemmer is one of the executive producers of Legends of Tomorrow.
It is revealed that Rip named his son Jonas in honor of Jonah Hex.
This is the second live-action appearance of Jonah Hex after the film Jonah Hex (2010) starring Josh Brolin in the title role.