Recently Sil mentioned about brightening up AVP-R though he said someone would have to pay him first
Well it inspired to look at a few scenes with the contrast and brightness altered to see if I could see a blooper or an interesting background event.
Sure enough I did. During the scene where the homeless men are attacked, the first man attacked convulses on the floor after falling unconscious and the air sacs of the hugger expand out at the same time. Its barely visible at its default brightness. It shows some detail went into that shot even though its only for a second.
During the same scene, if you look in the background when the Alien is arriving, you can see a crane or some arm along with alien moving into shot. It is noticible when watching it normally but it really stands out when the brightness is enhanced.