Visible crew/equipment: When in the limo, Jeanne is reading the newspaper and Salma is putting on make-up; on the left side you can see the shadow of a crew guy counting down so they can start their arguing scene.
Revealing mistake: All of the earthquake scenes are badly staged (since they were accomplished by the very low-budget technique of shaking the camera). Nothing except the actors ever falls down save for the occasional large object to grab your attention. This is most obvious in the scene at Saffron Burrows's home, as there are many things that should have been knocked over (lamps, vases, etc.) which are still standing upright despite many large shocks that have already occurred.