Quote Originally Posted by ShivaBlizzard8
I've heard that you don't need to get exactly 100% completion to get the perfect ending. Just really close. But I don't know that for sure. However, the extra in-game scene isn't worth starting over for, IMHO.
You do have to get 100% to see the Perfect Ending, I'm afraid. I don't believe it's worth it, though. Just download the video instead - it's far easier.