Because I got a PM asking me to explain why I don’t like that episode, here is a detailed explanation of why Time Enough At Last was the worst-written episode of the series (and I apologize in advance, for the “nit-picking“):
The first factual error in this episode occurs when we see Henry Bemis for the first time in the bank vault. We see the book flip open, then see the glass shatter in the pocket watch, followed by the sound of the nuclear device (supposedly a Hydrogen Bomb) being detonated directly above the bank vault.
The error is that in real life, we wouldn’t be able to see the book cover being flipped open, nor the glass in the pocket watch being shattered because the Electromagnetic Pulse prior to the detonation would have caused a power failure in the vault, extinguishing the light. Also, the same vibrations that shattered the glass in the pocket watch, would have also shattered the light bulb, and the glass in Henry Bemis’ eyeglasses. When he regains consciousness in the bank vault, the light bulb is still illuminated, which would not have been possible.
Next, when Bemis enters the bank president’s office, he hears the tape recorder playing. The EMP would have prevented that device from functioning, also.
When he leaves the bank and wanders around the debris, no dead bodies are seen. Yes, many of the victims would have been evaporated by the blast, of course, but not all of them, as photos from the bombings of Hiroshima and Nagasaki have shown that not everyone “disappeared,” and some folks actually remained alive for several years after those blasts.
He is next seen sitting in what is probably the remains of a former grocery store, munching on contaminated food, that probably has a high Strontium-90 count. This means that he should die within the next 5 days, depending on the amount of contamination he has consumed.
After he awakens from his nap, he finds a car and honks the horn. No sound would be heard coming from that car at all, because of the damage done to the electrical system (battery) by the EMP. Likewise, you would never have heard any kind of engine-cranking noise from a car with no functioning electrical system.
As he’s contemplating committing suicide with a gun he has found in the remains of a sporting goods store, he sees the public library and all those books.
Here’s a question for you: If a hydrogen bomb was detonated anywhere near a library, and considering that the bomb was powerful enough to “evaporate” human beings and level buildings, would there be any likelihood at all, that books (filled with paper that burns at +451°F/+232.78°C) would have survived such intense heat? No, there would have been no books for him to read, anywhere within a 20-mile radius of ground zero.
So, now you know why it was a poorly-written episode. Rod Serling just did not do his scientific research very well.