In the beginning of the movie when the people get killed inside the Jeep, there is blood all over the interior, but later, when the police are investigating the scene, there is noticeably less blood on the inside of the windows.
When Dr. Tiptree takes Susan's temperature, as the readout climbs over 100 degrees and passes 109 degrees, it reads "100" when it should read "110".
When Dr. Tiptree is holding Susan's feet as Susan lays a dinosaur egg, when the shot alternates between views of the top of Susan's feet and the bottom, Dr. Tiptree's hands change position.
The captions at the bottom of the screen, shown occasionally throughout the movie, show "Infected cells per 1 million" followed by a percentage figure. A percentage figure is unitless and not "per" anything.
When Barbara looks inside the Jeep with the corpses of the guys killed at the beginning, you can see that the girl is moving, and the guy is breathing.
When the dinosaur is gnawing on the girl's foot, In the green POV a hand is visible at the far right of the screen for a few frames pulling her leg.
When the T Rex attacks Jesse, there is a close of of its head coming at the camera, mouth open. This shot is upside down.
Dolly tracks are visible in the foreground when Doc gets trapped in the laser projection.
During the climactic battle, when Doc gets to his feet after being knocked to the ground in the bobcat, there is a lighting stand at the back of the frame, on which a flag is mounted (for shaping the beam).