Here's an image of the parasites that was never in the movie...but it's tantalizing when put together with other clues.
I've read an interview with J.J. Abrams that said the creature was still just a baby, and it had been sleeping underwater for thousands of years. He hinted that the object seen crashing into the ocean was a satellite, and the recovery of that satellite is what woke the creature up.
Now, if you look at that image it kind of looks like the parasites are underwater in the lights of some kind of submersible, which would support the hints Abrams gave.
What isn't made clear is whether those parasites were from the creature, or brought back on the crashing satellite. At the start of the movie we see the term "Codename Designate:Cloverfield" which suggests to me that the government was aware of
something before the attack began.
Part of the trouble with the decision they went with to use just a handheld camcorder effect was that it didn't allow them to jump to other characters and give any kind of backstory, as jumping from the camcorder effect to a regular camera would just pull viewer out of each portion of the film. What it did allow them to do was to give a more intimate, "you are there" feel, as well as give them an excuse to avoid big, expensive effects shots, which on their small budget of 22 million had to be kept to a minimum (Though there are a few great shots. The scene where the creature is getting bombed as the people escape is a highly complex, and most likely expensive, FX shot).
Also, at the end of the credits you can hear voices saying "help us". When the sequence is played in reverse it says, "It's still alive."
There's also some neat images hidden in single frames of the movie. While playing it goes by so fast no one would notice, but when one freezes each frame you get this..
King Kong
The Beast From 20,000 Fathoms
Like Abrams tv show Lost, Cloverfield gives us more questions than it answers, which convienently makes us want more. And considering the movie made 47 million in it's opening weekend you can rest assured there will be a sequel. In fact, there's already rumors online as to that...
...and that's MY tease. ;)