Monty Python is a British comedy troupe, famous for the television program Monty Python's Flying Circus and the films Monty Python and the Holy Grail, Monty Python's Life of Brian and Monty Python's The Meaning of Life.
For the anniversary TV special, Python Night: 30 Years of Monty Python, Trey Parker and Matt Stone made a short South Park homage to Monty Python with the "Dead Friend Sketch", a parody of Monty Python's "Dead Parrot Sketch". The cartoon also featured Terry Gilliam at the end.
Parker and Stone have cited Gilliam as an influence on the South Park animation style.
Monty Python alum Eric Idle provided the voice of Doctor Vosknocker in South Park: Bigger, Longer & Uncut.
References
In the episode, "Timmy 2000", Phil Collins talks and acts like one of the "Gumbies" from Monty Python's Flying Circus.
In the episode, "Best Friends Forever", an off-screen character says "Open the gates!" when Kenny is in heaven, in the same fashion as King Arthur in Monty Python and the Holy Grail.
In the episode, "Go God Go XII", the three Atheist groups in the future (Allied Atheist Alliance, United Atheist Alliance, Unified Atheist League) are a reference to the Judean socialist resistance groups in Monty Python's Life of Brian (The Judean People's Front, the People's Front of Judea, and the Judean Popular People's Front).
In the episode, "The Last of the Meheecans", the scene with Butters standing outside a house, naked, in Mexico is a reference to the He's not the Messiah scene in Monty Python's The Life of Brian.
South Park Studios also released a tribute video of Monty Python. [https://www.youtube.com/watch?v=eJBZ1_NcrDc]