- The Marauders died in the opposite order on their map. The order on the map was Moony, Wormtail, Patfoot, and Prongs, but James Potter died first, Sirius Black second, Wormtail third, and Moony last.
- Professor Trelawney predicted that Harry was a Horcrux. She said Harry was born in winter, he wasn’t, but Voldemort was born on 31 December.
- The driver and conductor are named Ernest and Stanley in honour of Rowling’s maternal and paternal grandfathers.
- Ron inadvertently predicted Harry and his future. A bowler hat, whom he said would work for the Ministry, ends up being an Auror. A hippo, their next lesson was about Hippogriff. An acorn indicates an unexpected windfall.
- Ron paid more attention to Hermione than anyone else, as he was always the first to notice her disappearance.
- In Goblet of Fire, Cedric Diggory is a player in the Triwizard Tournament. He is also the Seeker and captain of the Hufflepuff Quidditch team.
- In Deathly Hallows, Fred and George Weasley missed Bilius Weasley, who was the life of the party. Ron Weasley said that Bilius Weasley saw the Grim and died within 24 hours.
