You should be able to tell right away by looking at the grill, The new surround on the 2005's is smooth like this:
The 2005 model changes officially came in on July 1st 2004, but June 25th might be a new one.
The other changes that would be most noticable would be:
New Xenon headlights, rear lights, 3 piece dash rather than 5, bigger arm rests in the doors, and newly designed center console with some storage between the downtubes and below the handbrake.
You should check the sticker on the engine to make sure that it has 170BHP/PS rather than 163.
That's all i can remember for now.