Goofs

The Tyrannosaur was said to be twenty feet high, but when Joan Van Ark is seen running between its legs evasively, the dinosaur is clearly taller.

When Francesca and Hazel are at the river and are attacked by the tyrannosaurus, Francesca's hair is wet, but when she looks up at the dinosaur, her hair is considerably dryer.

The model of the polar-borer capsule has exhaust ports on the rear, but the full-sized version does not.

The animal misidentified as a Ceratopsian is actually a Uintatherium. It is also extremely over-sized in the film, as large as a multi-story building and the humans only reach up to its ankles. Real Uintatherium were about the size of rhinos, not much taller than a human. The film gives it three toes but it really had five.

From the outside, the Bore is noticeably too small to hold five people - it's bigger on the inside shots than the outside.

When hit in the head by a boulder, the tyrannosaurus' head visibly dents and then pops back into shape.

Watch closely during the pre-opening airplane sequence between Maston Thrust and his current girlfriend. During the exchange, Richard Boone clearly reaches both hands forward to grope the breasts of the actress and scores "Two Doubles" (reaching "second base" twice) right before the editor is forced to cut to another shot in hopes that he can get this scene past Standards and Practices. The audacity by Richard Boone is amazing given that this was intended to be a kids popcorn movie.

The elbows of the Triceratops bend forward and its horns wiggle, revealing it's a rubber suit operated by two men inside.

A crew member pushing the boulder at the T. rex can very briefly be glimpsed as the boulder begins to move.

Judging by its "three horny ridges" and "sharp tusks", Chuck Wade names the first prehistoric animal the group encounters as a Ceratopsian. Ceratopsians had neither "three horny ridges", nor tusks of any kind. This was a group that horned dinosaurs like Triceratops belonged to. But the animal in the film is a Uintatherium, an ancient mammal that lived long after the extinction of non-bird dinosaurs. It had nothing to do with dinosaurs, especially Ceratopsians.