(At around 33 mins) When the White Bitch "shows off" her White Castle, Kal Penn's character comments, "I feel like I've been there before." This is a nod to Harold & Kumar Go to White Castle (2004), which Penn had starred in three years prior.
(At around 19 mins) In the first cut of the film, the woman who warns Lucy not to enter the wardrobe that leads to "Gnarnia" was completely naked. On the basis of that scene, the MPAA gave the film an R rating. However, the filmmakers had anticipated that the nudity might be an issue, and had filmed the scene where the actress was wearing a bikini. When they inserted that scene and the board reviewed the film again, they immediately changed its rating to PG-13.
The first line a character says after seeing Jennifer Coolidge as the White Bitch is "Whoa, it's Stifler's mom." Coolidge played the part of Stifler's mom four times during the American Pie (1999) film series.
When Mr. Tumnus tells Lucy about the negative effects of the White Bitch's reign in Gnarnia, he says that under her leadership they have had two major wars, government surveillance of the people, and no gay marriage, as a Kanye West stand-in says "The White Bitch doesn't care about black people." This reflected the second term of then-President George W. Bush via his policy decisions for the wars in Iraq and Afghanistan and a NSA warrantless surveillance program, along with many states and judicial authorities refusing to make same-sex marriages legal (while this wasn't a strict policy decision, as legal proceedings that ultimately led the U.S. Supreme Court to make same-sex marriages legal for the entire country were led by private citizens and were ongoing at the time of this film, the Administration did not support these efforts in any way). The Kanye West reference comes from the superstar musician saying that President Bush didn't care about black people because of the incompetent Federal response to the devastation caused by Hurricane Katrina in 2005.