When Lou is tussling in the ocean waves, the bird's eye shot shows the beach with nothing but smooth sand, (even out to sea as the waves recede), however during the underwater shot at the same time, it shows a sea floor consisting of only rocks and boulders, not sand.
Within the first 5 minutes of the movie, a haunting bird call is heard. It's a Screaming Piha, which would NEVER be in that area. It is a jungle bird primarily found in Amazonian rainforests in Central and South America, a jungle bird. This is a big goof, like using the Australian kookaburra in old Tarzan movies set in Africa.
About 1 hour in, Lou uses a rifle scope to see into the cave, but the scope does not have magnification capability.
At circa 1.18 in, an injured Lou has her dog Jax by her side, but circa 51 minutes in, she had to cross a damaged rope-and-wood-slats bridge over a deep ravine and river, with the most of the deck hanging downwards at near 180 degrees to the horizontal. As there was no way that Jax could cross the broken bridge, she ordered him to go home. Jax later arrives at the beach and barks to alert the sheriff, who is riding an ATC trike. Jax was more loyal to Lou's needs than her command.
Towards the end of the film, Lou has a flashback of playing chess. A player's hand is seen tipping over a piece as if to resign. It is typical for the resigning player to tip over their King. But the piece in question appears to be a Queen.
The kidnappers have head-worn night vision, which is possible to have in 1986, but very rare, and would have been difficult to get even stolen from the Army as the purported special forces types they are. Not many were made by the mid-1980s.The model shown is a version of the PVS-7 not made until the 1990s. Though it shares a model name, the PVS-7A which did exist since 1982 was very different looking, with a much larger lens, different switches, different batteries and battery housing, and so on. The "goggles" (actually "bi-occular" night observation devices or NODs) shown did not exist at this time.
The stove used to make soup in the first henchman's cabin was not commercially available in the mid-80s.
For an agent trained in field craft and with years of experience, Lou continually walks around in the rain with rifle(s) on her shoulder with the muzzle pointing up (without a muzzle-cover). This allows water to get into the barrel--severely degrading accuracy AND possible catastrophic damage to the weapon/shooter.