In the video recorded flashback, the priests speak of the Codex Vaticanus and mention that the House on Willow Street is a site of evil due to it being the furthest point away from the Vatican where the Codex is kept (illustrating the fact with an apple). This however is geographically incorrect - the geographic antipode from the Vatican is located deep in the South Pacific Ocean, East of both New Zealand and the International Date Line and far away from any landmass that the movie might be set in.