Compared are the Spanish DVD (= US Version) by 20th Century Fox and the UK DVD (= Uncut Version) by Optimum/Studio Canal.
One Million Years BC is a co-production of Hammer Film Productions, Associated British-Pathé and Seven Arts Productions. In the US, 20th Century Fox brought it to theaters but only in a shortened version (approx. 8 min were removed). This US Version is still being released on DVD by Fox.
Most of the removed footage are fight and violent scenes to make the movie available for a bigger (younger) audience.
Besides that there are some general differences:
Spanish DVD (US Version): 87:59 min
UK DVD (Uncut Version): 96:04 min
Extended shot of the prehistoric pig's horn getting twisted.
An old man shrinks back from the fire. The "cook" tosses a stone at him which hits his head and makes him drop. Cut to the two girls, the tribe leader and the old man, who touches his head.
The tribe leader throws the bone away, two elderly men leap at it. Then some scenes of eating cave dwellers.
The US Version starts when Tumak appears.
Dissolve to the following sequence. Some scenes show Tumak checking out the area, in the process he passes a weird plant and a prehistoric skeleton.
Some missing scenes of the fight with the giant turtle. The cave dwellers toss some stones and keep it busy with their sticks. One of them gets on a hill and attacks the shell, but the attack can be rejected.
The giant turtle rushes forwards which makes the cave dwellers step back.
Cut to Sakana, who watches the girl with the bear skin being turned up on the table.
The girl starts dancing in front of the cave dwellers, Sakana seems to like it. The girl is being pushed back on the table.
Extended shot of Tumak checking the cave. He looks at the hot spring, the paintings on the wall and the paint.
The girl on the tree is being threatend by the dinosaur. Tumak gets his stick.
Extended shot of Tumak circling the dinosaur, cut to the girl. Then a couple of scenes that show Tumak fighting the dinosaur.
Extended shot of the dead cave dweller when he's being burried. Then a cut to Tumak, who's cutting his way through the crowd. The dead gets some adjuncts.
The fight of the ape-men continues. The inferior's head is being hit on a stone several times. Then he's dragged under the tree while his head is still being hit.
Extended shot of the heaven. One of the apes runs to one of the sticks with a disembodied head and sticks the head on it. Two further apes move some remains of cooking plus an earlier beginning of the shot of Tumak and Loana.
Extended fight vs. the pterosaurian. The men attempt to defend with sticks, but the pterosaurian also attacks Tumak and Loana in the water. Both can make it ashore.
The US Version starts with Loana's escape with the child.
The pterosaurian vanishes behind a mountain, Tumak and his companion follow him.
Missing shot of Tumak and his companion following the pterosaurian.
Loana is being washed up, then a shot of the fighting pterosaurians.
Missing shot of the pterosaurian eating the young, then a shot of Tumak.
Some missing fight scenes. Stones are being tossed at the attackers plus some wrangling.
Sakana escapes with Loana but she tosses her on the ground to kill an enemy. Loana attacks him with a stone. Then a cut to another girl who is being kidnapped.
Sakana grabs Loana and runs away.
The cave dwellers escape from the stones falling off. The tribe leader returns to his cave.
Some cave dwellers fall in a canyon, others on the ground.
A landslide swallows some cave dwellers.