I'm pretty sure you can't save the multiplayer replays, which sucks. I read that somewhere though, but I am not 100% positive its true. Anyone else?
Also, since we are on the topic, in GT3 you could hit the UP on the Digital Pad and the replay would be condensed into one video, perfect for watching close competition. Unless I am mistaken, you can't do this in GT4? Can anyone verify that?