(at around 1h 10 mins) The film includes a glimpse of a map showing Atlantis off the coast of Spain. It's a reference to Plato's theory that the construction techniques used in Egypt were imported from the ancient lost civilization of Atlantis.
This film features some alleged historical controversies, including the construction of the Great Pyramid 12,500 years ago (almost 8,000 years earlier than the egyptologists estimate), the existence of the Ben-Ben stone (the pyramid-shaped stone missing from the top of the Khufu Pyramid/the Great Pyramid), the correlation between the position of the pyramids and the stars from the Orion constellation (associated by the ancient Egyptians with the god Osiris), the Sphinx (originally being a statue of a lion) allegedly correlated with the Leo constellation rising from the East on the day of the Vernal (Spring) Equinox (when at the same time Orion is in conjunction with the Giza pyramid complex thus what's on Earth is mirroring the stars in the sky to commemorate the time of the construction), and the possible nonhuman origins of the first kings of Egypt.
D'Leh is "Held", the German word for "hero", backwards. Roland Emmerich chose the name as an Easter egg.
The constellation called the 'sign of the warrior' is actually Orion. It also played a key role in deciphering ancient signs in Stargate (1994).
D'Leh refers to one star as "the one that never moves." That would be the North Star, which appears stationary in the northern night sky. In 10,000 BC the North Star was Vega, the fifth brightest star in the sky. It would've been very obvious in the dark sky.