It is supposed to be night time when Pickett Smith drives through the forest. Shots of the forest and plantation house are dark. In other shots, however, the Sun and a clear blue sky are visible.
When they find the dead man in the pond, Pickett Smith rolls him over and his eyes are tightly closed. In the next shot, however, his eyes are open.
The positions of the leeches on Iris' body change several times between scenes, most notably the large leech on her upper right arm.
When Pickett Smith and Karen are walking through the willows, the day is completely clear. In the next shot, however, there is heavy fog. Then in the next shot, it is clear again.
When Iris is running through the forest away from the frogs, she falls and scrapes her knees badly. In the next shot, however, her knees are unharmed.
The film, which is supposed to be about killer frogs, actually shows cane toads.
When Jason Crockett and Pickett Smith are in the yard during the party, patriotic music is being played on a turntable. In one shot, you can see the naturally wobbly LP record album spinning, yet the tone arm is completely still and not making contact with the record at all.
When Pickett Smith is wandering around the island, he sees Grover lying face down in a marsh, where he was killed by being bitten by a venomous snake. Grover, however, is clearly still breathing.
When one character wrestles with the alligator in the pond, black tape wrapped around the alligator's jaws to keep them shut is clearly visible.
In the close-ups of the frogs in the film, one frog has obviously been thrown into the scene because it lands on its back.
When the gulls are flocking, someone off-camera is clearly throwing pieces of bread in the air.
Throughout the film, Jason Crockett has no movement in his legs. At several points in it, however, his knees move down underneath the blanket that he is wearing.
At about 9:55 into the film, although a large tree is back-lit by the Sun, Pickett Smith (Sam Elliott) casts a shadow on Stuart Martindale (George Skaff).
Many close-up shots of the cane toads in the film have the sounds of frogs croaking. Toads do not croak like frogs do, and what looks like croaking is their normal way of breathing.
At the end of the film, each stuffed animal head on the walls of Jason Crockett's trophy room makes a matching sound. The mounted bass, however, makes the sound of a dolphin.
From 1:00:45 to 1:00:50 into the film, while Iris is running out of the forest, you can see the shadows of both the camera and the cameraman filming her on the back of her dress.
When the snake is hanging from the chandelier, a close-up reveals that it is being held in someone's hand.
When Pickett Smith runs towards the porch with the gasoline, the reflections of multiple crew members can be seen in the windows.
When Clint is at Jessie's Grocery, he picks up the rope that was attached to the boat and says that it was "clearly chewed through." The close-up shows that the rope was very clearly cut, not chewed.
As Jenny is struggling to escape from the mud before being killed, she loses her balance and moves her leg out briefly from the stuck position, revealing that she is not actually stuck.
The American flag that is hung vertically on the porch of the Crockett family home in the film has the stars in the upper right. The proper way to hang it is with the stars in the upper left.