In Murderball, one of the people talks about the wheelchairs being like a Mad Max version of wheelchairs.
In Murderball, in a hotel, some of the guys from Team USA play a prank based on a scene from Ocean's Eleven.
Interviews with directors and star regarding creation of the film.
title reference/features Mark Zupan from Murderball
In the hospital while waiting for the baby to be delivered, two of Ben's friends play in wheelchairs and start fighting, while one exclaims "Murderball!"
Dean plays Murderball
mentioned by Bobby