First off . . . We've all been there, sometimes I spend a great deal of time there (feeling . . . )
LOW command automatically sets the TRIS and Port registers for you, as far as I know it does not set the analog registers for you, I am not sure as I virtually never use it.
ADCON is A/D Converter register, some chips do not use it as they have no A/D converters I E 16F628A has analog comparators but no ADCON.