Each member of the crew receives $32,761,349 from the first job they pull together. (The Nigerian Job)
Some of the cons mentioned (e.g., "The Fiddle Game," "The Spanish Prisoner," "The Wire") are real classic con games that are still in use, but most ("The Cherry Pie," "The Cuban Sandwich") are just the writers having fun.
Hardison (Aldis Hodge) always uses the name Lucille for his vans, as an homage to blues great B.B. King, who always called his guitars Lucille.
Many of the shady business practices the Leverage team seeks to correct are based on real life occurrences. For example, the antagonist in "The Order 23 Job" is transparently based on Bernie Madoff, and the trick the Retzings pull in "The Snow Job" was actually perpetrated on several families in the wake of Hurricane Katrina.