"Anachronisms: Not since Raquel Welch was battling the dinosaurs in One Million Years B.C. were so many anachronistic errors squeezed into one prehistoric-era film: (a) Metalworking - first copper, then bronze, then iron - was mastered around 5500 BC; (b) Exploitation of horses for human transportation started approximately 4000 BC; (c) The earliest pyramid was erected in Egypt circa 2630 BC; and (d) Mammoths had never been domesticated as pack animals." IMDB

Meh... I didn't thought it was that bad, but perhaps that's because I had little-to-none expectations. It's mostly on the "C" vicinity.

I must've been about 13 when I saw this (before I was a movie nerd), and even then I knew it was a piece of crap.