Continuity mistake: Atouk takes a white pumpkin from Gog and throws it at the dinosaur. When it lands on the dinosaur's horn the pumpkin is orange.
Factual error: After the giant egg 'cracks' open on the ground below, Atouk and his men move in for a closer look, and then begin eating the contents. Seconds later the black caveman slips and falls into the "yolk" and then begins dancing around as they cheer him on. When in fact, the boiling steam would've burned him.
Answer: The music playing while they are carrying the giant egg is from, "The Bridge on the River Kwai." It's a classic World War II movie, soldiers marching into a Japanese prison camp are whistling that tune.