Continuity mistake: When Indy's crew is lifting the stone door to access the Well of Souls, big clouds of white smoke come out from every corner. A frame later, from a wider angle, they're gone.
Continuity mistake: About to grab the idol, Indy passes a stick over a pile of sand on the ground which has a leaf on the center. A frame later the leaf is on the left side.
Continuity mistake: After the guy with the patch and the monkey greets the Nazis, Marion and Indy are seen walking through town, passing by an arched door. A frame later, from a different angle, they are passing by again and the amount of people around has increased.
Continuity mistake: In the marketplace standoff between Indy and his would-be attacker, in shots from behind Indy, he's facing one way, but in frontwards shots, he's facing a different way and when it cuts back to behind him, he's facing the other way again.
Answer: The scene you describe was indeed filmed. It was cut out of the US release of the film although I cannot speak for the Australian version. The scene also appears in the Marvel Comics adaptation. http://www.theraider.net/films/raiders/deleted_scenes.php has a list of this and the other deleted scenes.
Phil C.