Well, since the last thread about this got way off topic, I figured I would start a new one. Only this time to simply discuss the plot problems with the OT without making any kind of assumptions about each others' intelligence or 'true fan' status.
Most of the ones I have to start with come from ANH. Which, if you pay attention had numerous flaws in scene to scene continuity and logic.
First off, is one that was brought up in one of the Saga threads:
Where did Luke and Han stash their clothes while in Stormtrooper disguise? The standard answer has always been under their armor, but that is a physical impossibility for all those clothes to fit under that skin tight body glove that the Stormtroopers wear. That's not even considering where Han and Luke's boots went.
Here's the easiest way to disprove the "under the armor" argument. Take the clothes you wear on a daily basis, to include shoes, and try to fit a surfer's spandex body glove OVER all those clothes and put a pair of leather boots on OVER your shoes. It's not possible, even if it is, it would be extremely uncomfortable, limiting in movement and obvious to a casual observer.
Next is the Sandtroopers' shrinking blasters:
When the squad of Sandtroopers is marching through Mos Eisley's streets they are all carrying large blaster rifles and one even appears to be carrying a bazooka sized blaster. However, when they turn the corner to face the Falcon, they are all suddenly carrying the standard Imperial Blaster pistols.
A clear instance of scene-to-scene discontinuity.
The last example I will present for now, is one that Jargo brought up a long time ago. The iconsistency of the Tatooine homestead sets:
When Luke is in the garage, you can see the cockpit of the T-16 Skyhopper behind him with sunlight illuminating it from above. We all know that the top wing on the T-16 is huge and if the cockpit was level with Luke and Threepio in the garage, then the wing should have stuck out of the ground behind the homestead and been very obvious from the surface. The sets don't match up. What gives?