After the movie was released, the first known purple frog was discovered in western India.
Jon's grandmother Joan Favreau cameos as a field trip guide in a scene in Central Park Zoo. In another reference to Swingers (1996), Ricky (Vince Vaughn) asks Bobby (Jon Favreau) if he could pick up the "vibes" a girl was sending him.
The license plate of Jimmy's (Vincent Pastore's) limo reads "DBLDN11". This is a reference to a blackjack strategy articulated in Swingers (1996), that one should always double down on an 11.
There is reference to a company, "Cardiff Giant". The Cardiff Giant was a hoax conceived by George Hull, a confirmed atheist, after having an argument with a fundamentalist minister about the existence of "Giants in the Earth" as referenced in the Book of Genesis. In 1868, he built a ten foot carved statue, treated to look ancient, and buried it. A year later, when workers were hired to dig a well on his property in Cardiff, New York, the statue was discovered. A great public discussion ensued as Christian Fundamentalists defended the statue as proof of the giants. The debate went on long enough for Hull to make over twenty thousand dollars, charging fifty cents to peek at the "historic artifact".