Visible crew/equipment: A boom mic operator wearing a white shirt is seen reflected in the door that the female scientist opens, when the Umbrella personnel pick her up, as part of their extraction procedure. He is visible as the door is opening and very faintly when it is closed. (00:04:00)
Visible crew/equipment: When the SUV is struck by the large truck and is pushed along while upside down, a camera mount can be spotted (helps if you use slow motion) and also, a tow truck can be seen actually pulling the SUV along the street. (00:05:15)
Visible crew/equipment: In the scene where Nikolai is bitten and the horde bears down on the police and S.T.A.R.S., you can see some crew members and a floodlight. (00:29:35)
Visible crew/equipment: When Nemesis shoots the guy on the roof of the theater, you can see a machine that shoots out fire.
Answer: First, the T-virus affects humans and dogs differently - zombie dogs look like they've been skinned, but zombie humans just look dead. Second, there's little evidence that human senses have been dimmed, it's just that zombies are stupider without higher brain functions (explained in the first movie) and are slower because they conserve energy for actual attacks, not moving. Dogs are much more efficient predators than humans and don't need to slow down as much because a few bites will take down prey.
Phoenix