Continuity mistake: 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.
Continuity mistake: 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 mistake: 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. (Corrected in later versions.)
Continuity mistake: 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 mistake: 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. (Corrected in later versions.)
Continuity mistake: Arthur Weasley says that Ron and Harry have both been in the Forbidden Forest twice. Harry has gone in twice, but Ron has only gone there once, in The Chamber of Secrets while following spiders. (This differs from the movies when Ron is given detention instead of Neville).
Continuity mistake: At the beginning of the story Harry is reading 'A History of Magic by Adalbert Waffling'. However, from the Philosopher's Stone we know that 'A History of Magic' was written by Bathilda Bagshot and that Adalbert Waffling wrote 'Magical Theory'.
Answer: It's a jokey reference to Harry's Divination classes, where he has been studying the reading of tea leaves; in a recent class, Professor Trelawney claimed to have seen the Grim - an omen of death - in Harry's teacup, and has been regularly predicting his impending doom. By saying he's out of leaves and only has teabags, Lupin is trying to inject some humor into the situation in order to put Harry at ease, so he won't dwell on the Grim or any other death omens.
Cubs Fan ★