1. Which version has an illustration at the start of each chapter?
The American version

2. Which version has a picture of Buckbeak on the cover?
Both

3. Which version contains the following sentence?

'Good on you, Harry!' roared Seamus Finnigan.
The British version

4. The British version of the book has 317 pages. The American version has 435 pages. Why is the American version longer?
The American version has illustrations, and uses a bigger typeface, so there are fewer words on each page.

5. Which version contains the following two sentences?

Harry, Ron, and Hermione had already had two Defense Against the Dark Arts teachers, both of whom had lasted only one year. There were rumors that the job was jinxed.

6. In the British version, Peter Pettigrew turns into a vole. In the American version, he turns into a rat. Why?
This is a trick question; Pettigrew turns into a rat in both versions.

7. Which version contains the following paragraph?

Harry's eyes snapped open. He was lying in the hospital wing. The Gryffindor Quidditch team, spattered with mud from head to foot, was gathered around his bed. Ron and Hermione were also there, looking as though they'd just climbed out of a swimming pool.

8. In the American version, Mrs. Weasley sends Harry a scarlet sweater for Christmas. What does she send him in the British version?
A scarlet jumper

9. Which version contains the following sentence?

"Actually, I think Malfoy is right," said Hermione.
Neither

10. At the start of chapter 6 of the British version, George Weasley passes some "new third-year timetables" over to Harry. What does he pass over in the American version?
New third-year course schedules