When Sara inquires about "Jurgens Ridge", this is a reference to Dan Jurgens, writer/artist of DC Comics' six-issue mini-series, Time Masters: Vanishing Point.
Toward the beginning of the episode when Snart and Mick are talking about an old job gone bad there is a bottle of what looks like blue milk in front of Mick. A possible nod to Star Wars in which the drink is popular in the space cantina.