Steve shouldn't have had his thumb reattached by the ambulance.
At the scene where Francine is speaking in Mandrin to her mother, she is saying "Don't you think Stan is handsome."
From the computer database, Stan discovers that Francine's real parents live in Hilton Head, South Carolina. Hilton Head, S.C. is a completely flat barrier island. It looks nothing like the rolling landscape we see from the Dawson's estate.
Stan asks Roger if he ever saw Man on Fire, shortly before setting Roger on fire.
One of the firecrackers is named after The English Patient.
Another of the Firecrackers is a nod to to the Vietnamese prostitute in Full Metal Jacket.
Francine talks about watching T. J. Hooker with her parents growing up.