When Sam and Eddie pass behind Jackie's ( Jewel Staite ) car he takes a picture of her license: 5RN1TY. Jewel Staite was on the crew of Serenity in Firefly (2002).
Jewel Staite's character uses the alias Jackie Jarvis and is looking for Trevor Stark, both of which are references to Ironman.
Jewel Staites car registration was SRN1TY, referencing Firefly.