Just for reference, here are the recommended computer specs for playing that video:
= = = = = =
Mac OS X:
1.8 GHz PowerMac G5 or faster Macintosh computer; 1.83 GHz Intel Core Duo or faster
At least 256MB of RAM
64 MB or greater video card
Windows:
2.8 GHz Pentium 4 or faster processor
At least 512MB of RAM
64MB or greater video card
Windows XP Service Pack 2 or Vista
= = = = = =
So you can see that the iPhone is a bit out of that league.