Star Wars Episode 4: A New Hope - Forgot to Paint My Lightsabre
After Darth Kills Ben and Luke starts Blasting, The picture cuts back to Darth Vader with the blast doors closing behind him - his lightsabre has turned white!
Also in that same scene, right before the door closes, look closely at the sabre. It looks bent. The special effects people probably used a stick for the sabre then later put in the light with the computer effects.
Kind of like the Ministry of Defence that somebody said was spelled wrong in Austin Powers: The Spy Who Shagged Me....I just wanted to smack that person for being a moron.
This is NOT a slip-up. When lightsabers (or lightsabres) contact an object with enough force, they become really bright, like an explosion. You will also find this in Episode I in several scenes. For example, the lightsabers turned white when Qui-Gon Jinn struck Darth Maul's lightsaber on Tatooine. The producers did this on purpose.
First of all, Darth's lightsaber is NOT contacting anything in this scene, he's just holding it. Second, it's obviously not glowing white, it's just a white STICK. They messed up big time, and they didn't fix it in Special Edition either. Admit it.
One more thing: In the Star Wars Customizable Card Game, there's a card featuring this shot of Vader. (http://www.decipher.com/starwars/cardlists/anewhope/light/small/blastthedoorkid.html) As you can see, the people at Decipher made Vader's lightsaber red and glowing. Why would they go to the trouble if the white saber wasn't a slip-up?