There are at least some errors in the rivalry statistics for Private Leagues. I have one example: the rivalry page counts two wins in two games for me against Olimpia Levico Terme, while in reality both teams have won once.
Here are the stats:
Olimpia Levico Terme 0 0 0 0 0 0
KoriPullo-Pojat 2 0 0 0 0 0
Matches:
18.4.2008 KoriPullo-Pojat Olimpia Levico Terme 54 - 96 View PL
23.5.2008 Olimpia Levico Terme KoriPullo-Pojat 80 - 90 View PL