Call: I can't believe you did that.
Ripley 8: Did what?
Call: You killed it. It was like killing one of your own kind.
Ripley 8: It was in my way.
Ripley kills the alien in the corridor after it has killed the first member of the Betty crew but there is no melting of decks or bulkheads from the creature's acidic blood. Also, the Betty crew seem unaffected by all the acid.
Sigourney Weaver actually makes the basketball shot. Even though the ball is out of shot for a second, she made the shot with no assistance.