How others will see it. A simple small-town mystery involving rather dull characters and unheralded actors. That's how it starts, but the tension builds relentlessly until our doctor hero and his reunited flame are chased by a mob of pod people. Will the doctor escape from them? Will he score with Dana Wynter? Will any of the remakes ever be as good?
How I felt about it. Early evidence that his obvious 'B' movie is superior to its budget comes when the smitten doc declares, "I'm just a general practitioner. Love is handled by the specialists." Whether the quip is good or great is subject to debate, but the entire scripts of many costly star vehicles never offer anything as memorable.
Also debatable is the meaning of the film itself. The pod people genre is related to 'living dead' zombie movies, They Live, or any other science fiction premise where aliens, covertly or overtly, seek to replace the human race.
First, what are pod people? In Invasion of the Body Snatchers, they aren't messed up zombies, or ugly monsters. They look, act, and think just like the humans they've replaced. The only difference is that the passion is gone.
The film, thus, is a warning about the effect of a person's experiences on his or her own humanity. To protect our sensitive soul, we insulate it, then hold it captive, and finally suffocate it. We become a pod person. The script even refers to this process.
But there's more going on than this. The paranoia and fear of the minority. The condescension and confidence of the majority. And the immense perceived difference between the two camps. This is similar to ethnic, religious, or political divisions in a given society. The pod people, for example, remind me of Republicans. Your mileage may vary.
Ever wonder what the pod people will do once they've taken over all the humans? They must be boring even to each other. There's a movie that will never be made.
An important (and inevitable, since a pretty girl is required) subplot in Invasion of the Body Snatchers is the relationship between McCarthy and Wynter. Both single after recent failed marriages, they are eager to rekindle the courtship between them abandoned some years earlier. The alien crisis increases the velocity of their romance. McCarthy accomplishes in two days what may have taken weeks in a more placid environment. But newfound love, even with a hottie, has its drawbacks. She's more of a burden than a help, and eventually even works against him.