You know when Hudson is getting the knife trick done to him, I think it's around 31:14 look at Apone in the background, his laughter is sped up, probably because they had no choice, with the knife trick and all.
Also, when Ripley is first in the powerloader at the beginning, you could see Spunkmeyer in another Powerloader in the background, and it's obvious he's an action figure or model or something!
I still love this film anyway! In my top five!