When Capt. Tom Churchman gets attacked by a zombie and gets pulled into the hole into the ground by the tombstone, a red light is shining out of the hole and when the zombie and Tom go into the ground you see the outline of the circular lamp that is used to give off the red light as the fog is coming out of the hole.
Though the film is set in the U.S., much seen in the film gives away the fact that it was filmed in Montreal, Canada. All commercial products seen are virtually exclusively Canadian (Molson, Labatt and O'Keefe beer, Players cigarettes etc.), Quebec road signs (Arrêt/Stop signs, etc.), the reveresed bilingual "Park Harpell" (instead of Harpell Park) and many more.