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In the film, Harry just has the shard of Sirius’s mirror. A 30-second flashback explaining its origin would have fixed a major plot hole for casual viewers.

This is the biggest fix. In the book, Voldemort falls as a "common man," proving he was just a mortal. The film's decision to have him turn into confetti ruins the "Tom Riddle" humanity of his demise. harry+potter+and+the+deathly+hallows+part+2+20+fix

The book features a massive final brawl where centaurs, house-elves (led by Kreacher!), and the residents of Hogsmeade join the fray. The film’s focus is a bit too narrow. In the film, Harry just has the shard of Sirius’s mirror

Seeing the Hogwarts kitchens empty out to defend the castle would have been a visual and emotional highlight. In the film