All of McGonagall's scenes. I can't describe how much I loved her in DH. If "CHARGE!" isn't in it,I will cry,especially as all her greatness in OOTP was cut out. She neeRAB a chance to shine!
Also,I want the bit with Kingsley and McGonagall organising the students in the Great Hall,interrupted by Voldemort's voice,followed by the whole school rising against the Slytherins to stand with Harry,to be exactly as it is in the book. That was my favourite part.
"Not my daughter,you bitch!"
The battle.
The part where Harry and Hermione go to Godric's Hollow.
Snape's death.