Army of Darkness (1993) - 34 mistakes
Directed by Sam Raimi, starring Bruce Campbell, Embeth Davidtz
Visible crew/equipment: When Ash is running from the evil presence, before it has overtaken him, he stumbles and falls a few times. At one time he jumps over a fallen log. When this happens, the camera (evil presence) breaks through a tree stump to come after him. If you watch in slow motion, or are very observant, you will see that there is a kabuki mask inside the stump. Must be some crew-members idea of a joke.
Deliberate "mistake": Ash's car breaks out into the courtyard and the whirling, windmill thing batters the Deadites aside. We see the carnage a couple of times filmed from different angles, one Deadite, planted, legs apart, gets battered twice and the guys who come in from the left and are quickly jerked off screen are shown again seconds later.
Continuity: In the shot where Arthur's men have just started the spiked walls moving in the pit, Ash looks at the walls intensely. In this shot, if you have the full screen version on, you can see that his chainsaw is attached to his hand. They use that same shot later on right before he charges over to climb the wall.
Continuity: At the beginning when the wise man says to King Arthur something along the lines of, 'I believe he is the one written off in the Necronomicon. He who has been prophesied to fall from the sky and deliver us from the terror of the deadites,' He is sitting on the horse to the right of King Arthur. When King Arthur says, 'What? Who? Likely he is one of Henry's men,' the wise man is now on the other side of Arthur.
Continuity: Ash, Henry, and the other prisoners all have clean, non-sweaty faces and neatly combed hair after trekking across the hot, dusty lands in the "chain gang" line. This is particularly noticeable on Henry just after Ash demands that the prisoners be set free; even his little hair decoration is still in place.