Contributed by: Roger Awalt
When Holmes is about to jump through the opening in the floor that leads to Moriarty's lair, he grabs an old oil lamp as a "weapon". Thinking better of it, he sets it on the floor; which results in him tripping over it and falling through the hole in the floor. However, between the shot of him setting the lamp down and later falling through the opening, there is a shot of him listening to Moriarty's conversation. In this scene, the lamp had been transported back onto the hook on the wall from which Holmes had removed it.