Star Wars Episode 1: The Phantom Menace - Obi-Wan's Quick Hands
During the final lightsaber battle when Obi-Wan, Qui-Gon, and Darth Maul get cut off from each other
and Qui-Gon kneels down to meditate look behind him at Obi-Wan, he's standing with his lightsaber
pointed downward. Then, in the very next scene, (the close up of Obi) it shows him with his lightsaber pointed upwards, and then he brings it down and deactivates it.
I agree with the guy above this! It isn't really a slip-up when he could have moved it upwads. Why don't you get a pole and see how quickly you can move it up, its not impossible you know!