At the end of the film we see our hero's leave on camelback.

But the question is, how did the camels get there? When Imhoteph brought Evelyn and Beni in the sandstorm, and Rick, Jonathan and Ardeth Bay flew there.

There is a scene in the script, just after the two expeditions reach Hamunaptra, where one of the Americans asks Beni where all these stray camels came from, and he says "they belong to the dead, they wait years for their masters to return before leaving"

This scene is not in the film, there is no explanation of strays. Suddenly in the final sequence at Hamunaptra, we have these camels.

woops.