Continuity: At the Leaky Cauldron, Mr. Weasley tells Mrs. Weasley that, for several months, Sirius Black had been overheard in Azkaban repeatedly whispering "He's at Hogwarts" (unknown at the time, referring to Peter Pettigrew). But later in the Shrieking Shack, Sirius says that he learned Pettigrew would be with Ron at Hogwarts the same night he, Sirius, escaped. Submitted by Cubs Fan

Continuity: When they first come out of the Shrieking Shack, the order is Crookshanks, Lupin, Pettigrew, Ron, Snape, Harry, Hermione Sirius. However when they go back in time, the order is now Lupin, Pettigrew, Ron, Hermione, Snape, Harry, Sirius.

Continuity: Before Harry and Hermione go back in time, it mentions that Buckbeak is tied to a tree. But when they go back in time, Buckbeak is tied to a fence. Submitted by Issabee

Continuity: On page 341 (American hardback) "it says "Ron crawled to the four-poster and collapsed onto it". But when Professor Lupin comes in, it says "his eyes flickered over Ron, lying on the floor". This could not be, because Ron is still in the bed.

Continuity: In June, Fred and George Weasley find out they have scraped "a few O.W.L.s apiece". However, in subsequent books, it is firmly established that O.W.L. results are sent home by owl and are not received until August.

Continuity: When Harry and Hermione leave from the hospital wing using the Time Turner, Dumbledore says it is ten minutes until midnight, but on the way back to the ward after they rescue Sirius, they hear Dumbledore say to the other versions of them that it is five minutes to midnight.

Factual error: Chapter sixteen (Professor Trelawney's Prediction) takes place in June 1994. In the beginning of page 341 (Bloomsbury edition) of that chapter, Harry Potter reads a note from Hagrid and says, 'Buckbeak's appeal - it's set for the sixth.' The night after the Hippogriff's appeal, Remus Lupin is forced into a werewolf form by the full moon, which means that this happened on the night of June 6th, 1994. The web page http://www.hp-lexicon.org/timelines/main/timeline_1990s.html#1994 also backs this up. However, a brief look at lunar phase calendar sites such as http://stardate.org/nightsky/moon/index.php?month=6&year=1994 and http://mysite.verizon.net/bonniehill/pages.aux/lunar/lunar.phases.1994.html definitely shows June 9th, 1994, as a new-moon night, which means that a full moon could not possibly rise three days earlier.

Continuity: When Harry is buying his books at Flourish & Blotts, it mentions that he is being served by the manager. But when Harry was staring at the book 'Death Omens', it says that he is being served by the assistant of the store. Submitted by Issabee

Continuity: On page 53, Mr Weasley says that Ron and Harry have ended up in the Forbidden Forest twice. But only Harry has been in the forest twice. Ron went once to see Aragog with Harry in Chamber of Secrets, but the other time Harry went was for detention in Philosopher's Stone, and Ron wasn't there. Submitted by Issabee