another tiny OOP flint (don't know if this was mentioned already)

[Kaitlin]

On page 557 of the US version, Cho asks Harry, "Remember the first 
time we played each other, in the third year?" (She's referring to 
the match where Wood told Harry not to be a gentleman and to knock 
Cho off her broom.)  Well, when this match took place, Cho was in her 
FOURTH year, according to PoA, not her third.  
~Kaitlin