At the end of the opening credits, just after "Screenplay by David Mamet" and before "directed by Ridley Scott", look at the right hand side of the screen - you can see Hannibal's face drawn by pigeons.

In the brain eating scene, the piece of brain Ray Liotta eats is actually a piece of cooked chicken.

In the scene where the pickpocket is trying to get Hannibal's fingerprint on his bracelet, the cinema in the background has a poster for Gladiator - also directed by Ridley Scott.

Gary Oldman originally wanted to share top billing with Anthony Hopkins and Julianne Moore. When the producers denied his request, he declined to have any billing at all and, in the original theatrical release, remained uncredited at the film's opening and closing credits. However, he is credited in the VHS & DVD releases.

Not a mistake, but something I just noticed on about the 5th viewing. In the very creepy 'I've given very serious thought...to eating your wife' bit, during the ominous pause in the middle a fly crawls down the back/side of Anthony Hopkins' head, then flies around a bit. Can't be helped, and barely noticable, but it does wreck the mood a bit.

Not a mistake, just a bit of irony....there is a vegetarian cookbook on top of the refrigerator that Hannibal has Clarice trapped against, also a guide to Southern Cooking.