Bloody Disgusting is reporting on the origins of the Cloverfield monster tonight. Upon viewing the film closely, you will in fact see a satellite fall out of the sky and into the ocean in one of the film's video flashbacks.
Bloody Disgusting writes:
In the FINAL, FINAL scene of the film we see Beth and Rob on a Ferris wheel at Coney Island. He pans the camera to his left to shoot the ocean and if you look to the far right of the screen you will see what appears to be the monster falling out of the sky and into the water. IN AN UPDATE: B-D reader 'afireinside' tells us, "JJ stated himself that the monster has been down at the bottom of the ocean for thousands of years. What fell into the ocean at the end of the movie was a satellite. If you pay attention to the viral marketing, Taragutu's site states that one of their satellites fell out of orbit and was lost. This is what woke up the monster from its dormant state." You be the judge....
In addition, at the end of the credits an audio clip reveals that the monster is not yet dead.