Indiana Jones Without FX - Things You Didn't Notice

Nowadays, with computer generated imagery, it's a lot easier to achieve supernatural FX in movies. But, back in the day when computers were still figuring out how to CGI, moviemakers would often have to come up with many weird and wonderful techniques in order to achieve the desired effect while still looking halfway decent.
And I can't think of a better example to demonstrate some of these ingenious techniques than the Indiana Jones movies.