I have not seen this movie in a long time, but: When they are on the asteroid, Steve Buscemi calls Bruce Willis "Bruce" instead of his character's name.
It happens once they're on the asteroid or whatever, I'm not sure exactly when. I think it happens right near the point where Steve Buscemi plays around with that really cool double machine gun.
This is actually NOT a slip-up. He does not say "Bruce." Forgive me for not having their names right, I haven't watched this in a while and I just forwarded it to this part:
Right after they go around the moon, Independence goes down, and the other ship lands on the asteroid. The guy with the funny teeth (like i said earlier, I forgot their names, don't bite my head off.) This is the text:
(They do their engine seals and pressure seals check), the pilot guy turns around and says: "Anyone hurt?"
Camera does close up of funny looking teeth guy, he is clearly panting and catching his breath. He says:
"WHERE'S..(pants, catches his breath)...WHERE'S THE OTHER SHUTTLE? What happened to the other shuttle?"
Then the pilot goes: "Independence is off the grid, etc, etc."
So he did NOT say BRUCE...he said WHERE'S. Check it again.