Question: I'm sure I have seen this film in colour. Does anyone know if it has ever been shown in colour?
Chosen answer: I've seen it colorized several times on TNT and FMC.
Question: When the gang explore the ruins of the city, you can hear a low pitch humming noise. What was making that noise?
Question: Why isn't one dead pigeon, dog, or other wildlife shown in the streets of New York? And at the end, the three survivors walk away and a flock of birds flies off. Where did the birds come from? It's doubtful they were underground or in a shelter.
Answer: If some humans survived, then animals could as well. Birds, being able to fly, could have escaped the radioactive cloud before it became inert. For the rest, IMHO, this is a 1950s, low-budget movie. Cheap production values, little attention to detail, and no CGI made for a "no frills" set design that lacked realistic things like dead animals or human corpses. There were also stricter rules and standards about what could and could not be shown in movies. Showing rotting corpses may have been considered unsuitable or distracting. It could also be argued that the filmmakers wanted to create a visual image that humanity is restarting from a "blank slate."
Answer: Because she wasn't paying any attention to the color.
Disney-Freak