Or rather, part 1 and 2 mixed up, emphasis on part 2, since the producers made the York tetralogy into a trilogy. I haven't read the Henry VI plays more than once, and that was many years ago, but even my vague memories tell me the most obvious cut - the entire Jack Cade rebellion. Which means no scenes not involving the nobility, which fits with the entire production trying to lure the Game of Thrones audience in.

( Cutting just in case someone minds being spoiled for Shakespeare and tv alterations of same )