Any film series with multiple directors is going to have mistakes and inconsistencies. That's the nature of the beast. But because Alien is a masterpiece, people seem to forget the rules still apply. You just gotta accept it, and rationalize the canon errors the best you can. Example: "The Alien Queen was a form of evolution, and the Aliens could have other means of creation." See, I just made that up, but if you want to include the egg creation scene from Alien, you gotta fill in the blanks yourself. I have a feeling Prometheus is going to be riddled with canon problems. Which leads me to another question: What is alot of your guys beef with Aliens? It's a great, well made, film and really turned Ripley into the character we think of today. In a few ways it excelled it's original, and should be commended for it. I just find it mind blowing so many "purists" think it's crap and should be erased from the canon.