The time displayed on Jim's wedding video is 3:15, a reference to the time at which supernatural forces consistently awaken the character of George Lutz in "The Amityville Horror".
The term "Anti-Deadites", referring to those who are opposed to Dale's "lifestyle", comes from a combination of the terms "anti-Semite" and "Deadite", "Deadites" being those who are possessed by evil spirits and transformed into bloodthirsty monsters in Sam Raimi's "Evil Dead" series.
The date on the home video footage of Jim's wedding is 02/10/2013, exactly 28 weeks after the date on the footage of his proposal. This is a reference to the 2007 zombie film "28 Weeks Later".