Danny DeVito (Frank Reynolds) did the makeup for his daughter at one point. DeVito was a trained and licensed cosmetician before he became an actor.
Brian Fitzpatrick, who plays one of the officers at the end, once appeared on a show called NightMan (1997). Nightman is a recurring character created by Charlie in It's Always Sunny in Philadelphia.
The mall Dennis campaigns in is the same one in which in he and Mac have the wheelchair race in Charlie Gets Crippled (2006). It was also featured in the final scene of Superbad (2007).