In the Harry Potter and the Order of the Phoenix, Harry encounters Neville and his grandmother at St. Mungo’s visiting Frank and Alice.
Neville tells this story to Harry in the Order of the Phoenix film.
Eagle-eyed Harry Potter fans should be able to recall that Neville Longbottom’s (Matthew Lewis) grandmother, Augusta Longbottom, does make just one blink-and-you-miss-it appearance, as played by actress Leila Hoffman, in the film series, escorting her grandson to Platform 9-3/4 in Harry Potter and the Sorcerer’s Stone.
However, this brief, heartbreaking scene didn’t make it into the film.