sometimes some stats can give an indication of a lacking of skill.
eg: 7 turnovers, or 1-8 FT shooting. these m ight indicate low handling/passing or Free throw.
Also, if you have say a 6'2 C, his box score may also give an indication to his actual abilities that are causing him to classified as a centre.
eg: 6'2 C, who gets 13 rebounds, is probably high in rebounding.
its only ever an indication though and shouldnt be read as gospel.