Corrected entry: In any of the scenes when it is raining, the characters are wet, but rain is never actually hitting them. It's like the rain is falling in front of the camera and not on the actors. This is very obvious when Klaatu and Jacob are on the small bridge, right after Jacob is saved from falling in the water. Jacob is looking up at Klaatu, it's pouring outside, yet his face is completely dry. Also, in the long shot showing them on the bridge, the creek is running under the bridge, but no rain can be seen hitting the creek.
Corrected entry: When Reeves starts bleeding in the train station he is bleeding on the right side. When he applies the cocoon goop in the clear bottle he applies it to the left.
Corrected entry: After their planning session has ended, the scientists are loaded into helicopters and hover or move above ground relatively near the expected impact site. Though dramatic, this action is completely illogical. They would have to go underground, or at least as close to the ground as possible, to perhaps stand a chance of survival. The shock wave associated by even a small object impacting at that speed would be greater than a blast produced by any nuclear bomb, and it certainly wouldn't be survivable in a helicopter (that would at least crash and probably disintegrate in mid-air after being impacted by a hypersonic wavefront), but it might be possible to survive the blast underground. Putting them in helicopters is, given the expectations, equivalent to suicide. Not one even protests - and they are supposedly some of the best scientists in the world.
Corrected entry: Before the impact, the scientist all put on hazardous material suits. Why? They were expecting an asteroid (or similar) to impact Manhattan with cataclysmic results. Their primary concern should be survival, not the investigation of a dangerous crater, certainly not without any prior unmanned or satellite reconnaissance. It's almost as if they were actually expecting an extraterrestrial visit.
Corrected entry: Klaatu comes from a planet near a distant star. His "spaceship" travels at 3x10^7ms-1, which is 1/1000th the speed of light. At that speed, it would take over 4,000 years to reach even the closest star. Why did Klaatu have to leave? In 2000 B.C we were hardly killing the planet on a significant scale.