Corrected entry: If all the other Jedi in the previous movies disappear, why doesn't Qui-Gonn do so when he is killed by Darth Maul?
Corrected entry: After Queen Amidala and her crew enter the palace and escape through the window, because the droids don't let them pass the hall, they use ropes to climb to the upper floor. Look at the movement of the people while reaching the upper window, you can clearly see that the filmed action is shown backwards. The way everyone lifts his legs to the edge of the platform outside the window indicates that the shot was taken from actors letting themselves down from the window on ropes and reversed.
Correction: Listen to the film's commentary track from Lucas, who complains that the shot had to be done repeatedly because they could never get the winches to *pull everyone up* in unison.
Corrected entry: Why is technology so much more advanced in this film than in the others? Surely technology should progress, not regress!
Correction: It'll hopefully all be explained in the next two films - linked in to the clone wars, etc. Have patience...
Corrected entry: Qui-Gon, Obi-Wan and Jar Jar travel through the planet Naboo's core to get from the Gungan City to Theed. Two points: 1) If the planet's core isn't molten, the surface should be frozen and uninhabitable. 2) Even if it's water all the way down, the pressure would eventually reach hundreds of tons per square inch and squish our heroes like bugs.
Correction: This could just be a Gungan phrase for going throught the underwater caves.
Corrected entry: In the opening story text of The Phantom Menace, it refers to Obi-Wan and Qui Gon Jinn as Jedi knights- but Obi-Wan is still a padawan and not yet a Jedi knight.
Correction: He's a Jedi Knight in training and is ready for the trials. Close enough, particularly as the opening text must, by necessity, be brief.
Correction: And Qui-Gon is a Jedi Master. Like the other correction said, it's for brevity during the opening crawl.
Corrected entry: When Obi-Wan is hanging on to the ledge when he fights Maul, he sees Qui-Gon's lightsaber on the ground next to him. The design of the hilt is the same as Obi-Wan's. No two Jedi have the same hilt design.
Correction: There's no rule stating that Jedi must have a unique design - Jedi build their own lightsabres using whatever design they see fit to use. There's nothing to prevent Obi-Wan from building one similar to his master's sabre.
Correction: Multiple explanations for this. My preferred one is that he didn't accept his death (Yoda and Obi-Wan both do), and as such he doesn't disappear.