The Saw (2004) & Saw II (2005) sets are so exact that they look as if they're the same ones used in the original films. The Saw producers asked if they could use the bathroom set from this film for Saw III (2006).
The inability of Shaquille O'Neal to make a free throw in order to save himself and Dr. Phil McGraw is somewhat of an inside joke. Although considered one of the greatest basketball players of all time, he is often criticized for his poor free throw shooting.
"Scary Movie 4" was originally supposed to spoof superhero movies. Later, the studio released "Superhero Movie" as a spin-off of the "Scary Movie" franchise. The studio planned another spin-off under the title "Sci-Fi Movie", but dropped it.
André Benjamin had a role that spoofed Cillian Murphy's character in Red Eye (2005). The scene was when Cindy (Anna Faris) and Brenda (Regina Hall) were in an airport to fly to the Village, Andre's character pulled a taco out of this coat and offered a bite to Cindy who declined. His line was "If you don't eat the taco, your dad will die". The footage was reportedly shot but never used in the theatrical cut.
This was initially intended to be the final film in the Scary Movie franchise, but Scary Movie 5 (2013) was released by The Weinstein Company on April 12, 2013, in a different storyline, with Simon Rex, Charlie Sheen, and Molly Shannon in different roles.