Visible crew/equipment: When the duo first enter the Vortex (the indoor circus place) they stop to look at themselves in the wobbly mirrors. The mirror also reflects the cameraman filming the scene. The image is distorted and upside down but he's definitely there and becomes clearer as the shot progresses.
Visible crew/equipment: As the scene changes from Raoul Duke and Dr. Gonzo speeding to pick up all of the equipment for the photo shoot in Las Vegas to Dr. Gonzo talking on the payphone beside the aquarium, take a look at the reflection in the aquarium. If you look very carefully you can see a bald crewman dropping fish food into the tank, getting the fish to move with the camera towards Dr. Gonzo.