Alien- The interior of the Derelict. (No-where is it stated it is a different Derelict so we must assume it's the same one.)
Alien3-Several elements of Fury 161 are inaccurate from basic structure to the camo on the Pulse rifles.
Alien- Despite the Jockey having his ribcage torn open there's no visable acid burn in the floor.
Aliens- "Tip, caseless." -Hicks, describing a standard issue Pulse Rifle, why then shortly after Aliens in A:CM do they suddenly have cases?
Prometheus- Fifield's pups are in the Derelict for some strange reason despite it being implied they belong to him alone-
"Pups?"-Milburn "Yeah, my Pups."-Fitfield
Alien3- Michael Bishop Weyland is human in the film, yet in the game he is an android without even red blood as some have hypothosied.
Alien3- Hicks died, we know this for certain in the film because Andrews identifies him using his implant.
A:CM ignored this fact.
But that's just speculation, don't you understand your word doesn't make it true?
You have to back up what you say with evidence.
And remember what the Prometheus found? Death, as Shaw mentions and Peter found an Engineer.
It's almost certain the company thought, "well let's not waste more money like Peter did" they weren't even sure there was anything of value on LV426, as shown by them casually visiting while it was convenient via the Nostromo.
And A:CM for the reasons you listed alone about all the contractors, flight time etc can be considered bullshit on that alone.