Lachlan's s venom is in tubes with pale blue caps; those are Vacutainers with sodium citrate, a reversable anticoagulant for blood to be tested for coagulation functions.
When Bo says "maybe on a plane" when she talks about the snakes it's a reference to the film Snakes on a plane (2006)
Greg Bryk, Cleasby, the berserker, also played a werewolf on Bitten