Continuity: The cave bear tears the head off the man with the blue eyes. In the very next shot there is no trace of blood anywhere on the bear.

Factual error: The clan people look nothing like Neanderthals, they look like Cro-Magnon with a little dirt on.

Continuity: At the beginning of the movie when Ayla's mom is dying, Ayla grabs on to a finger or her outstretched hand. The scene cuts and Ayla's mom has her hand wrapped around Ayla's hand.

Revealing: When Ayla gets her leg cut by the lion, the claw that cuts her doesn't look like a lion's paw (it looks like a bear) and you can see the "blood" is already on the paw and coming out of it as it dragged across her legs.

Continuity: When the lion cuts Ayla's leg there are three cuts, however, when Isa finds her passed out, there are four cuts.

Continuity: The C-shaped scar on the right chest of the man that likes Ayla changes shape between the time he is wrestling and the time he stops Ayla.

Revealing: When Ayla is looking at her "ugly" reflection in the lake she moves her hand down and a second later the reflection moves its hand down.