QuoteAgreed, but still disagree about retcon point. By that logic, every change to a property would be considered retcon.
Only changes that affect older materials or prior events. Introducing the Queen changed our perception of the eggs onboard the Derelict, especially for those who had read the movie's novelization or script and knew about the egg-morphing idea, because the implication was that all the eggs on the Derelict were the crew of the ship, morphed into eggs. It calls back to Lambert's ominous line when they're exploring, "Where's the rest of the crew...?".
The introduction of the Queen changed that, and filled in that gap in the Alien's lifecycle.
The revelation that Leia is Luke's sister is a retcon, but it doesn't actually contradict anything we didn't know - it just fills in more information, and by doing so it changes how we view those two characters and their interactions up to that point. Such as the scene in Empire Strikes Back where Leia kisses Luke - that scene evokes a completely different reaction from the audience with the later knowledge that they're brother and sister, even though that "fact" doesn't actually change anything within the story itself.
The 'Saw' series is filled top-to-bottom with retcons, revelations that certain characters were in certain locations or did certain things which changes your perceptions of how those events originally played out. The events themselves didn't change, but learning that other things were happening "off-camera" that don't actually contradict what was going on in the prior movies, they just fill in blanks.
QuoteThe EU has problems, but it pales in comparison to the AvP movies and their cornucopia of sloppy continuity errors.
I dunno, I've been able to work around a good number of the "continuity errors" in the AvP movies.