The Abbey piece has the same shape for both players (= means only the Z-shape exists but not the mirrored S-shape ) !
https://boardgamegeek.com/image/5943243/cathedral !

-*_*-
Besides this general error, concerning all Mattel plastic editions, there exist some Rare Copies that have 15 pieces for each player (instead of 14) !!!
That's because the Academy tile (consisting of 5 spaces) is available in both ''nomal' and mirrored shape for each color !!!
https://boardgamegeek.com/image/5957138/cathedral
https://boardgamegeek.com/image/5950888/cathedral