Visible crew/equipment: When the T-Rex is running rampant in the streets, we see a guy running away from it. He tries to run into a video store, and the shot is from inside the video store. Right before that guy gets eaten by the Rex, he runs to the door to try to open it. And when this happens, you can see the reflection of the cameraman in the glass on the door walking towards it.
Visible crew/equipment: When Sarah and Nick return to the trailer with the baby T-rex, there is a shot of Nick carrying the rex towards the operating table. Look between the baby rex's legs - there are a series of wires leading from a opening in the anamatronic dinosaurs belly to a bulky device (presumably a battery pack) in the actor's pocket. Once you know where to look for the wires, you will notice them in many other shots in the film when various actors are holding the baby rex.
Visible crew/equipment: In the scene where Ian is speaking to Mr. Ludlow while the group is walking through the rain. If you watch in the background when Ian says the word "Long" something falls from the top of the screen. An extra even follows the item as it falls, you can see his head move. Hard to miss.
Visible crew/equipment: When Sarah is returning the baby T-rex to the parent dinos, just as she is about to release the baby so it can "walk" back to its parents, look at the bottom of the screen. You can see someone's head pop up for a second, presumably a crew member taking the animatronic baby from Sarah.