When the zombie soldiers come out of their graves, their tombstones have the names of veterans of the horror and zombie genre. Easy to read are Jacques Tourneur, G.A. Romero ( George A. Romero), Jean Yarbrough, and Delbert Tenney (Del Tenney). Harder to read are Lucio Fulci, Victor Halperin, and Gordon Douglas. The (readable) graves have this order: Romero and Tenney in the first line, behind them Fulci and Halperin, and in the last line behind Fulci is Tourneur, who is in the middle of Douglas and Yarbrough.
WILHELM SCREAM: Used twice - A zombie gets blasted with a shotgun, and a zombie gets dragged by a car.
Title in Spain: El Ejército de los Muertos (Army of the Dead)