After Lacey explains how tips from "gropers and frat boys" will pay off her student loan, Wendy says "It's Simone de Beauvoir turning in her grave". De Beauvoir was an early feminist writer and the founder of feminist existentialism.
The Middle Jet is a Harrier Jump Jet, in the US this attack/close air support craft is used by the USMC. The Harrier is the only successful VTOL military aircraft ever made.
When examining the fingerprints of the police, Ida identifies one as Leslie McClaine. Leslie McClaine (as Les McClaine) was the artist who drew the original Middleman comic books.