The Solomon Epstein story line is based on the short story "Drive," which details Epstein's efforts to develop the engine that is now used on most spacecraft seen throughout the series.
This episode marks the second actor to appear in The Expanse that was a lead actor on the show Being Human(U.S.) Sam Huntington plays Solomon Epstein in this episode and he played Josh Levison on Being Human. Kristen Hager played Ade in season one of The Expanse and played Nora Sergeant in Being Human.