General Hammond says that the people SG-1 brought back from Chulak in Children of the Gods (1997) (Part II) identified the last four symbols that the Goa'uld used to escape. However, in that episode, the only one near the gate was Jack, and he didn't see the symbols either.
General Hammond is placed in the isolation room with O'Neill, but is not there in subsequent shots of the same room.
Australopithecus was much more ape than Homo sapiens and pre-dated humans by millions of years. He had only 1/3 the brain capacity of Cro-magnon or Neanderthal and stood only 3-4 feet tall.
The planet is shown to have a dark side and a light side (as if it were a "one-face" world.) But the terminator between light and dark is way too sharp for (a) a planet large enough to have Earth-like gravity and (b) for any world with an atmosphere.
Blue sky is visible through the trees in the planet's "dark side," suggesting the film was artificially darkened and the closer-up scenes not showing the sky may have been done under different lighting conditions.
In the zoom shot past the bulls' heads into the hall of the Land of Light, the entire camera rig is visible as a shadow moving over the right side of the picture for about 10 seconds.