1. Love
If Syaoran is a descendant of Clow, that would mean that Clow would have had to have children at some point. But if he was only with Yue and Kero when he died (there was obviously no wife on the scene) how did he end up with descendant's? Unless Madoushi from the first movie..hehe
2. Life
Clow was a powerful magician, but he was still human. If Clow was reborn then he would have had to be 'born'. If Eriol was born..where are his parents?
3. Age
Exactly how old is Eriol anyway? In the anime he is supposedly 10 but he has that really grown-up voice. In the manga they said he supressed his growth so he is actually alot older than he looks..how much older?
4. Last Name
If Eriol is a reincarnation of Clow, who was Chinese/English, how did he end up with a Japanese last name? Unless his father was Japanese, but then what would he be doing all the way in England? Plus when asked by Sakura if he was used to speaking japanese with friends, he said he didn't have any. Obviously if one of his parents was japanese, he could have told her he learned from them. So we know his parents were not Japanese at least. Did he just make it up or what?
5. Attraction
If Syaoran was attracted to Yukito/Yue's power, and Yue was made by Clow..why was he not attracted to Eriol too? Is it because Yue gets power from the moon while Eriol gets his power from Darkness? but if that's true then Syaoran would have also been attracted to Kaho because Eriol put moon power in her bell, and yet, he loathed her.