I loved the shadow of the smoke on the cyclorama starting at the 45 second mark. Another for the collection. (My favourite is the shadows of the crater wall being cast on the sky in
Mission Stardust - if you squint and use your imagination you can just about make it out in this crappy Youtube version:
It's the best bit of the whole sorry mess of a film probably the only film to feature a scene where a spaceship is captured by nurses with machine guns:
and the unspecial effects included scratching raygun blasts into the emulsion of the film with a butterknife.
(which is all getting seriously OT - my apologies)