On the subject of the portkey/triwizard cup...

[revanto]

No: HPFGUIDX 46305

I may have been possible that Moody/Crouch only set the portkey to 
the graveyard. There might be a possiblity that the ghosts of his 
parents or Fawkes power may have reset the portkey in some way so 
that Harry could return. James says to Harry to go straight to the 
portkey as it'll take him back to Hogwarts.

Revanto
- "I have the ability to disapparate and apparate in the exact spot 
I'm in!"