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: 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.
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)
Answer: As seen in the first film and in this one, Lecter demonstrates an almost supernatural ability for eluding the law and seemingly being in two places at once. This film was made in the year 2000, before airport security became extremely tight in late 2001. At that time (before 9/11), it was still possible to enter an airport's main concourse through the baggage claim or even from the tarmac without passing through rigorous security. As ingenious as Lecter was, he could have accessed the airport in a number of ways back then. Relieving another passenger of his boarding pass and identification would be no problem for Lecter, either (simply leave the passenger's body in an airport toilet and assume his identity). For the most part, it was Lecter's calm, self-confident charm that allowed him to slither through society always ten steps ahead of the law.
Charles Austin Miller