10 Things Every Harry Potter Fan Wishes Were In The Movies
6. The Full Prophecy
"The one with the power to vanquish the Dark Lord approaches... born to those who have thrice defied him, born as the seventh month dies... and the Dark Lord will mark him as his equal, but he will have power the Dark Lord knows not... and either must die at the hand of the other for neither can live while the other survives... the one with the power to vanquish the Dark Lord will be born as the seventh month dies...."
There is really no explanation for fans who haven't read the books as to why exactly Voldemort targeted Harry Potter as a baby. They mention parts of the prophecy, but they never explain it in detail, or go into how it relates back to Harry.
They also fail to mention that, had things gone differently, it could have been Neville who was attacked by Voldemort as a baby, and the entire history of the wizarding world would have changed. So, essentially, the entire basis for this story is left out of the films.