I actually have a qualm with one scene in Empire Strikes back that strikes even me as not canon, despite George Lucas writing it or not.
Battle of Hoth.
Luke Skywalker barely escapes his crashed T-47 Snowspeeder from being crushed. He then proceeds to jog under an AT-AT, for some unknown reason has a grappling hook, hits, flies up, knows exactly where to cut the AT-AT- and here's the real kicker, out of BLUE has a thermal detonator and throws it into this magical compartment, causing the AT-AT to crash.
WTF?
The lack of humanity in Luke Skywalker is what makes me despise the main character of Star Wars. Love the movies, hate Luke.