Visible crew/equipment: In the rural airport scene a zombie is killed as Roger is filling the helicopter with fuel. As the zombie falls off the boxes, the tubing that pumped the blood is coming out of his pantleg. (From the Divimax widescreen DVD) (00:24:00)
Visible crew/equipment: When the two kids in the airport attack Peter and try to bite him, notice in the top right corner a crewmember's hand comes into shot. (00:25:40)
Visible crew/equipment: When Peter is attacked coming out of a doorway (after he leaves the boiler room) he wrestles with two zombies. If you pay attention to the bottom of the screen, just before he pushes the zombies away, you can see the hands of a crew member come into the frame. They were probably making sure none of the zombie actors fell into the camera. 2003 Directors cut DVD version. (00:49:02)
Visible crew/equipment: In the scene where Roger and Peter are getting the trucks to block the mall entrances, in one shot when they are both in the same truck you can see, in the side window, a crew member is driving a white van. After Roger gets out of the truck the van is gone. (00:55:00)
Visible crew/equipment: When Roger hits the zombie with the truck, notice at the bottom right a trampoline from which the zombie jumps off. (01:04:55)
Visible crew/equipment: When Peter and Stephen are locking the glass doors to the mall, you can see reflections of the cameraman in the glass. (01:17:45)
Visible crew/equipment: When Peter and Stephen have finished locking the whole row of "pretty indestructible" mall doors, Peter sets the security alarm. Soon after, the team drives off. A few zombies are shot on the go. As a wounded Roger skids the car to a stop in front of some exit doors, it passes an undecorated space with glass doors right before "John's Shoe Repair." There's a cameraman standing in the back of the space, with another two crew-members squatting down next to him against the wall. (01:25:35)
Visible crew/equipment: After the main characters have entered the mall through the skylight, and have gone down the stairway in order to secure the mall, Scott Reiniger and Ken Foree open the door into the corridor leading to the control room and boiler room. Whilst walking through said doorway, there is movement in the shadows in the top left. This has to be a crew member, as the only other zombie that is in this area is in the boiler room.
Visible crew/equipment: When Peter is shooting through the door a hand can be seen in a few frames.
Visible crew/equipment: After Roger says, "Lets go, baby. Number 2" and closes the truck door, you can see part of a crewmember reflected in the window.
Visible crew/equipment: When Roger is talking to the guy next to him at the start of the film the guy gets shot and for a brief second you can see a fake blood packet covered by make up.
Visible crew/equipment: During the ghetto holocaust at the beginning, when Willie kicks open the last door (before Peter kills him) you can see the camera's shadow on the door as it swings open.
Answer: One of the cops that was with Joe Plato (how much you have seen of them will depend on which version of the movie you, but I HIGHLY recommend the fan made/edited 'Extended Mall Hours' cut on YouTube) asked them for cigarettes. You'll notice that Roger and Fran lit up cigarettes as they were taking off, that's what Roger was laughing at.