Revealing mistake: In the end when Mulder is reading the paper in the park. The paper is clearly a prop. Only the frontpage is real - when he puts the paper away you can see that the rest of the paper consists of blank pages. (01:45:45)
Revealing mistake: In the scene where Captain Love and Antonio Banderas (as Zorro) meet in the hallway of the hacienda, two guards rush down the hallway and drop their rifles and swords. Zorro asks them to bend over and then proceed to kick/nudge them out the window. If you watch carefully, you'll notice that the guard on the right (furthest from Zorro) reacts to the kick too early. (01:33:30)
Revealing mistake: In the beginning scene on the Bak'u planet the stone bridge bends under the weight of the child. (00:04:15)
Revealing mistake: In the climax scene, Joe is climbing up the Ferris Wheel. He is huge, and weighs a ton, but his strong hands do not break a single lightbulb on the framework of the wheel.
Revealing mistake: When Alain is holding Guido's dead body and telling Steinkampf that he "died as a Legionnaire", you can see Guido swallow if you look at his throat.
Revealing mistake: When Chris is being hanged you can see the back of his jacket being pulled up from the harness.
Revealing mistake: When Jackie falls from the helicopter, in the close-up of him falling towards the trees, you can see a wire coming from Jackie's' left; using slo-mo helps. (The use of slow motion is permitted if things such as crew or equipment are visible.)
Revealing mistake: When Oscar and Felix are driving on the highway, you can see the passing cars waving to the camera.
Revealing mistake: When the dog with its legs in plaster is walking across the passageway the first time you see it its back legs are moving although they're supposed to be crippled.