I believe that I may have discovered a potential easter egg about Red Dead Revolver.
"Swift's Cod Liver Oils" may seem like a normal advertisement amongst others in the game but this one caught my attention. The last name "Swift" is very rare in the Red Dead saga, only the outlaw named Jack Swift has it.
I also think that the name Swift being related to an elixir is a nod to Jack's nemesis, Mr. Perry. As you all know, Jack Swift's nemesis is Professor Perry, a madman who is known for inventing an elixir that provides great resistance to its user (and perhaps teleportation abilities).
Side note:
The font and format that were used for the vitamin B (or whatever that is) imprint is similar to The Brimstone Epitaph's logo seen in Red Dead Revolver. Although that detail might have been just period accuracy and not an actual connection.
