When Crystal is checking her mail near the end of the film, the zip code on the top letter reads 701209. The last five digits transposed backwards read 90210, the show that the director, Jason Priestley, starred in during the 1990s.
When Crystal meets Jillian for the first time, Jillian refers to Crystal, desparagingly, as "Walmart Wendy." Later, when Crystal pulls some jars of spices from her cupboard to donate to the soup kitchen, three are clearly labeled "Great Value", a Walmart brand.
In addition to Amy Acker and Gina Holden, David Haydn-Jones has also been in Supernatural (2005), although many years later.