The music used in the film was from a Capitol/EMI Records Hi-Q stock music library, on which the copyright was in the public domain, and cost the filmmakers $1500. It was originally used in Teenagers from Outer Space.
The only real mishap to happen during filming involved producer and actor Russell Streiner's (Johnny's) brother, Gary Streiner. After the scene where 'Duane Jones (I)' sets the chair on fire, it was Gary's responsibility to extinguish the flames and set the chair ablaze again to preserve continuity, ensuring that smoke would be seen emanating from it near the end of the film. At one point Gary's sleeve caught on fire and, as he ran in terror, S. William Hinzman (in full zombie makeup) tackled him to the ground and helped extinguish the flames, saving him from major injury.
The Pittsburgh police provided personnel and equipment.
The role of Ben was originally meant for Rudy Ricci. After Duane Jones had read the part, however, it was given to him, and Ricci played one of the zombies.
The social commentary on racism some have seen in this film was never intended (an African-American man holing up in a house with a white woman, a posse of whites shooting a black man in the head without first checking to see if he was a zombie). According to the filmmakers, Duane Jones was simply the best actor for the part of Ben.
The stock music that accompanies Barbara's initial flight from the cemetery zombie was taken from the score for The Hideous Sun Demon, and had been used a year earlier, in the final episode of television's The Fugitive.
The undead are never referred as zombies. The best description the media can come up with in the film is "ghouls".
The word "zombie" is never used. The most common euphemism used to describe the living dead is "those things," mostly by Cooper.
The zombie hand that Tom (Keith Wayne) hacks up with a kitchen knife was made of clay and filled with chocolate syrup.
There are two known deleted scenes that were removed at the insistence of distributor Walter Reade Organization. They include a 8-minute expository scene in the basement between Helen and Harry at the bottom of the stairs (which explains the abrupt jump cut shown) as well as a wide shot of numerous zombies covering the landscape, which was replaced with footage of zombies eating near the end of the film. This footage was presumed lost when a flood damaged the storage facility years later at Latent Image, Inc.
There were two trucks used in the film. The first one used in the beginning of the film would not start for the trek-to-the-gas-pump scenes and had to be replaced. Unfortunately, they forgot to break the headlights.
This film is ranked at #9 on Bravo's _"100 Scariest Movie Moments, The" (2004) (mini)_ special.
This was one of the first films added to the National Film Registry of the Library of Congress because of naïve business practices that allowed the copyright of the film to slip into the public domain.
Though the cast and crew of the film had nothing but positive things to say about Duane Jones (Ben), Marilyn Eastman (Helen Cooper) would later refer to him as a tortured individual, due to the racial tensions which were still high in the United States during the late sixties. Karl Hardman (Harry Cooper) had become good friends with Jones, and Jones' unfortunate death in 1988 affected him greatly. He would often become emotional when talking about Jones, and believed he received a rotten deal in life due to the nation's racial tensions.
Though the radiation of a detonated satellite returning from Venus is theorized to be the cause of the dead rising and attacking the living, according to the filmmakers, the actual cause is never determined.
When applying makeup for the actors playing zombies, Marilyn Eastman focused less on a rotting appearance for most of them (it can still be seen on several, including herself in the "bug-eating" scene), instead concentrating on a prominent facial feature that each actor or actress had and making it appear more prominent for an unsettling image.
When the movie was in its scripting stage, John A. Russo had developed an idea that was basically described as "teenagers from outer space". This version was not filmed, but the version that was filmed uses stock music from the movie Teenagers from Outer Space.
When the writers decided to base the film on zombies, they brainstormed about what would be the most shocking thing for the zombies to do to people and decided on cannibalism.
When the zombies are eating the bodies in the burnt-out truck they were actually eating roast ham covered in chocolate sauce. The filmmakers joked that it was so nausea inducing that it was almost a waste of time putting the makeup on the zombies, as they ended up looking pale and sick anyway.
While writing the script, George A. Romero and John A. Russo were trying to think of a manner in which to destroy the zombies. Marilyn Eastman joked that they could throw pies in their faces. This is obviously an inspiration for the pie fight scene in this film's sequel, Dawn of the Dead.