At various points throughout the film, the weather and/or terrain change drastically in implausibly short distances.
As the main characters open the cabin door to investigate the noise and release the raccoons, Jim and Will's rifles change position in their hands. They disappear when the camera angle changes.
Tranquilizer darts are fired from specially equipped airguns, blowguns, or crossbows, not standard lever-action cartridge rifles.
Some shots and scenes are very badly focused.
When Jim walks up to the bear while everyone else waits, some green equipment becomes visible in the lower right corner of the screen.
When the wolves are shown on screen, depicted as keeping their distance from the people who pass by on the nearby trail, the wire that is restraining the front-most wolf from potentially mauling the actors is clearly visible is it drags on the ground.
None of the hawks or eagles seen with the characters are species native to the United States.
There are scenes which obviously take place in very distinctive locations in very famous California park locations, all of which are very distant from each other- sometimes by several hundred miles- yet they are portrayed to be within a partial day's walk. For example, when the tiger is "trapped in a canyon" it is clearly outside the automobile tunnel at Mammoth Lakes ski area, however, when it "escapes" it apparently has "no place to run to except the ghost town" which is obviously Bodie, over an hour's drive from there. Similar problems occur shooting in iconic and unique locations such as the tufa of Mono Lake or the very easily identifiable Old Griffith Park Zoo (empty) in Los Angeles of all places.
Will and Jim are supposed to be seasoned outdoorsmen, yet they constantly handle their rifles with their fingers on the trigger, point at things with them, or sweep others with their muzzles. At one point, Will plants his rifle's muzzle of his into the ground, which a properly trained rifleman would never do.
Will, Jim, Morgan, and Paul wear heavy winter clothing with thick jackets, hats, and gloves when they encounter the bikers. Snow was on the ground, yet the bikers ride comfortably, at high speeds, in short-sleeved T-shirts.
Will Cooper represents himself as a park ranger, yet he never wears a uniform or badge.
Will and Jim discuss bringing the Jeep when they talk on the radio in Helen's cabin. Later, the characters drive a Toyota Land Cruiser J40.