JKR's Plot hole

[roseswicegood]

No: HPFGUIDX 36163

I hope this has not been covered before--does anyone know what the 
plot hole was that JKR had to fix in GoF?
On another topic, my teen (not a real HP fan) said--why couldn't 
Moody/Crouch turn anything into a port key like from his office?  
*My* response :-) as I always have one, was that a port key would not 
work inside Hogwarts and thus the Tournament had to be held on the 
quidditch field.  Please no angry words if this has been covered, I'm 
new here.
Rose Swicegood

*to JKR:  please bring back Remus Lupin...