Crew or equipment visible
(at around 9 mins) When Dallas is going through the computer login sequence to communicate with Mother, and all the green-lettered commands are flashing by, the word "ALIGNMENT" is spelled "ALLIGNMENT".
(at around 1h 19 mins) When Ripley is accessing the company's secret orders, the screen says "OVERIDE" instead of an "OVERRIDE". In the same scene it then says "PRIORITY ONE - INSURE RETURN OF ORGANISM". "Insure" is the wrong verb (suggesting that the company should take out a policy with an insurance company). The statement should be, "ENSURE return of organism."