- Movie Goof (revealing mistake): In the opening scenes when Neville is driving through the supposedly empty city, another vehicle can clearly be seen driving along the same road in the distance
- Movie Goof (factual errors): SPOILER: At the movies end, Dutch arrives in the morning to discover Neville dying in the fountain, where he then takes the bottled "serum" that will be used as the cure for future generations, and leaves. The problem here is with the contents of the bottle. As shown in the film, the liquid is a clear red, but in reality it should be one of two things: Either it would contain drawn whole blood - which would look almost black - or it would be completely clear in appearance. The reason for this being that in order to properly separate the components, the blood would first have to be spun in a centrifuge, meaning that the bloods various elements (plasma, platelets, red blood cells, etc.) would all group together according to their weight. The end resulting product as shown in the movie, however, would have a high probability of being ineffective or even dangerous due to the fact that the "serum" is either contaminated or incompletely separated. That in itself could possibly be a death sentence to anyone attempting to use it because of the hazards of mismatched blood types - and this concoction certainly has enough red blood cells remaining to cause a severe reaction.
- British studio Hammer Films had previously contemplated a film adaptation of Richard Matheson's book under the title of "The Night Creatures", written by Matheson himself. The project was ultimately deemed too graphic, floundered and eventually died.
- Movie Goof (revealing mistake): As Neville zooms past the Family members on his motorcycle, no light appears on their bodies in the POV shots despite the fact the motorcycle light is on.
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