Ok I've brightened it up a bit in iMovie HD.
Here are my observations:
07:00
There is something in the frame just as the "From the Director of Alien" fades out.
To me it looks like a foreboding figure dressed in black. It looks like half of the giant head from the top down wearing a breathing aperatus. I think this might be a Jockey shot. Can see something greenish on the right of the screen. Like the goo.
07:11
Ok, the above shot crossfades directly into a close up of the big head. It looks like the shot form the EW article, only reason I noticed it this time. So I'm thinking the previous dark figure IS the being that the head is based on.
(just a note, the quality of the footage is so bad that I can only tell that this is the head based on the silouette of the crown of the head and the line of the nose, everything else is just shadow)
08:00
Something or somebody drops from the top to the bottom of the screen down a hole.
08:14
Ok definitely an explosion hitting the derelict.
08:28
No idea what that is. Definitely a creature. It ain't a cat that's for sure.
I genuinely think it looks like a proper classic extra terrestrial creature. Kind of like the tall alien from Close Encounters from The Third Kind.
12:22
Looks like a creature from the side on. To be honest I can't quite speculate what it is or could be.