X-Files, The - Please Hand Me That Stake
The has to be one of the most avoidable slip-ups I have ever seen. In the episode Bad Blood season 5, about 34 mins. into the episode, Mulder is retelling to Scully how he was being chased back to his hotel room by the pizza delivery-boy vampire, the scene switchs to the actual scene of what happened, you see Mulder breaking up a wooden chair so he can have a stake to kill the vampire, as he is breaking up the chair with his feet, you see a stake being slipped in to the other broken chair parts by someone off screen, you can even see the hand that is holding the stake, the hand drops the stake Mulder than picks up the stake and is ready to kill the vampire.
Season 5 Bad Blood episode