Part 2 of the "Terrance and Phillip" movie not being shown as an April Fools' prank in place of a "Special Presentation" is a reference to creators
Trey Parker and
Matt Stone not showing Part 2 of
Cartman's Mom Is a Dirty Slut (1998) (entitled
Cartman's Mom is Still a Dirty Slut (1998)) on April Fools' Day 1998 in place of the Terrance and Phillip episode "Not Without My Anus".