The fresco in the Prometheus goo chamber showed a Xenomorph creature before David had a chance to work with the goo. I don't mean to nitpick there, it's more a

The fresco in the Prometheus goo chamber showed a Xenomorph creature before David had a chance to work with the goo. I don't mean to nitpick there, it's more a comment on continuity in multiple movies. I'm an old school Aliens appreciator; I recognize as canon Alien and Aliens, and the Dark Horse comics of the early 90s (80s?). It's easier on my old brain than juggling plots from 20 different people.