When David (Jonathan Higgins) is driving in the rain, the song playing is "(I'm Not Your) Stepping Stone", which originated on the television series The Monkees (1965), which Bob Rafelson created. The version in the film was performed by his son, Peter Rafelson.
Samuel L. Jackson and Stellan Skarsgård appeared in Deep Blue Sea (1999), Thor (2011), and The Avengers (2012).
The movie never solves the case of the runaway girl.