At the point where the Marines have just ''had their asses kicked'' and Hudson and others are arguing aboard the APC.
At 00:54 here - https://youtu.be/cOAQH84bSPg?t=51
Hudson is shouting that he isn't going back in there and, as Ripley starts to speak, he looks up at her and- briefly, catches the camera by accident as he does so.
Photo here - https://ibb.co/K9DfBFZ
Why did Cameron leave it in?
-It's a good take performance wise.
-Can easily been interpreted as looking at someone else in the vehicle.
-Its not terribly egregious.
-From the mid-80s perspective, it took the until the internet and internet people who pour over and analyze every inch of footage for little minute details for anyone to ever notice.
No need to edit it out.
💯
shareOK he looked at the camera... now what?
shareThis is a prime example of "you've watched the same movie too many times" syndrome.
share