Revealing mistake: After Evolet got hit by the arrow and presumably dies, D'leh is staring at a mammoth. Behind the mammoth, you can see that the background is a picture.
10,000 B.C. (2008)
Directed by: Roland Emmerich
Starring: Cliff Curtis, Camilla Belle, Steven Strait, Joel Virgel, Marco Khan
Continuity mistake: When D'leh is talking to the Egyptian "god", he walks up to the army of Egyptians. He walks to within arm's length of them, but in the next shot, he's several paces back.
Revealing mistake: In the scene where D'Leh is chasing deer across an open plain, there is a row of 4 to 6 cars with headlights on in the distance coming down a gentle slope.
Evolet: Baku, D'Leh is here.
D'Leh: I found the eye of the snake.
Question: What happen to D'leh's dad?
Answer: When the mammoth numbers diminished, D'leh's father (the chieftain) left on a quest to find new hunting grounds in order to feed the tribe. Not knowing the true nature of his quest, many tribesmen thought the chieftain left because he was a coward, which was a source of anxiety and guilt for D'leh. Later in the movie, it is learned that D'leh's father was captured by slavers and died as a slave.
Answer: It is explained that he decided not to wait for the last hunt and left to find another way to feed the tribe. He left in secret so that others would not follow him abandoning the tribe.