Eagle-eyed fans of Harry Potter will have noticed a new scene in the film which was popped in to give us a clue about the young wizard's past.
But did you spot it?
For those that didn't, it was the flashback scene, where you see Lily Potter clutching onto baby Harry in her house.
It gives more information about the death of Harry's parents, showing how they lived when Voldemort went into their home to kill them.
Screennwriter Steve Kloves has revealed that JK Rowling wrote the new scene in full, but director Chris Columbus chopped it into flashbacks - probably making it shorter in the process.
He also admitted that he added in some new moments to the movie, including Hagrid's inability to keep secrets and Seamus Finnigan's habit of blowing himself up.