The couple use Motorola devices to talk to each other on the island, but the logo on them was only used by Motorola starting in 1955, four years after the story takes place.
The late '40s Chevrolet "woodie" that picks them at the airstrip is clearly a modified street rod. It has a lowered ride height and an aftermarket steering wheel and instrument gauges.
At about 9:40, Nancy sees a large bird over the flock that they're observing. She tells Edgar that she's spotted a peregrine (falcon). Peregrine falcons are about the size of a pigeon, not the large bird that she just spotted.