Yeah, The ammo counter is in the wrong place for the pulse rifle, but I've only seen the Mk II, not a profile of the original Rifle, so I can't add that to the list.
The face-huggers in med lab are accurate. there were 6 at the start, 2 were alive, 4 dead. Bishop dissected 1. Burke released the other 2 on Ripley and Newt later on. Unless I am missing something, it seems accurate.
I would add Hudson's Pulse Rifle to the list, but they call it 'Hudson's Pulse Rifle', It may have been set to burst fire. And the whole "Short controlled bursts," could have been said to Ripley and Vasquez (Ripley not having the experience and Vasquez being trigger happy). So I'm waiting for a little more evidence, I'm sort of hoping someone will watch the movie and start counting rounds, but I won't ask anyone to do this.
If I'm wrong about any of these, let me know and explain why, (pictures / vids help alot,) and I'll add it to the list.