Mick understands police code, which isn't surprising due to his history with cops.
The mentions of the brothers that run a rival hamburger restaurant to Big Bang Burger in San Bernardino is a reference to the McDonald brothers, Richard and Maurice, who founded McDonald's.
The episode shares a similar title with the fifth season episode "Meet the Legends".
When Sara and Gary crash-land and see a dog outside their ship, Gary says he's been fooled by cute dogs before; referencing the time that he accidentally adopted a hellhound (off-screen) in "The Great British Fake Off", and the Legends subsequently had to deal with the ramifications of his actions in "Ship Broken".
When Spooner shoots the alien and it fries on the sign, when it falls to the ground part of the remaining sign says "Crispy Bugs".