Error 1: “Complete” simply means long and “incomplete” means short. Correction: completeness depends on the appropriate genus and differentia/property, not length.
Error 2: Every distinctive attribute is a differentia. Correction: a differentia is intrinsic; a property can be extrinsic yet peculiar to the species.
Error 3: A common accident can define a species. Correction: because it can apply to several species, it fails the test of discrimination.
Error 4: Replacing a word with a synonym is always a complete essential definition. Correction: this usually clarifies language rather than analyzing essence.