During the scene when Neo and Morpheus are hanging from the bottom of the helicopter, there are two shots when the camera is mounted above the windscreen looking in at Trinity. The first time they show the shot it's fine, the second time, as the helicopter turns, you can see the shadow of the camera move across the front of the helicopter.
Now, this might not happen to all people but when I noticed a camera shadow in a movie, I like it. It gives a sence of realism (sort of) in a weird twisted way (if its not too darn obvious). Now, if the sun is directly behind the camera, and there is no camera shadow, then it leaves me in an uncomfortable position wondering how they managed the scene, and whether it was a computer touchup. I prefer a non-touch up, (for more realism). But dont get me wrong, if you can see the camera, like in Commando with Swazznegger on the reflection of the car in the carpark scene (you can even see the guy holding the camera with jeans) i really hate those moments. It can ruin the film and make it look cheap. But a really difficult camera shadow that can only be picked up by hardcore movie watchers are fun to spot.