Visible crew/equipment: Near the beginning of the film while Clarice is being interviewed, we can see a black T-shape during a shot of the floor. This is shown to be an actor's mark, as someone steps right into it a few shots later. (00:12:58)
Visible crew/equipment: In the scene after Hannibal escapes agent Clarice in the mall and leaving her shoes as a gift, Mason Verger's henchman that answers his phone in the van has a reflection of a camera crew in his shades. (01:39:05)
Visible crew/equipment: When we see the FBI agent running through the woods, if you look at the ground you can see track marks. They are consistently the same distance apart and starts once it goes to the angle from the front. Clearly marks from the tracking camera.
Visible crew/equipment: When Mason is laying on the hammock, a crew member is reflected on his glasses.
Answer: In the book it says that Clarice had caught Buffalo Bill before he could. It said also that is why he hated her early in the book.