Mr Priest says he brought in 30 of the 42 Black Wing subjects. 42 is a Douglas Adams' Hitchhikers Guide to the Galaxy reference, where 42 is the answer to life, the universe and everything.
The car's odometer is at 42 miles which is a reference to Douglas Adams' other series, The Hitchhiker's Guide to the Galaxy.
When Suzie cleans Scott's room, a Lux Dujour poster is visible on his wall.
Tina tries to aim the "air gun" by squinting with her opposite eye, as opposed to correctly sighting it with the eye on the same side as her gun-hand. This shows that she is not very familiar with guns (fitting for a Sheriff's Deputy in a town where "nothing ever happens").
Frija has a scissors-shaped badge on her cotehardie, visible in the close-up.