The manuscript is free of typos and grammatical errors.
Every reference cited in the text is listed in the bibliography, and vice versa.
Proper names are spelled consistently. Acronyms are defined on first use and used consistently throughout the manuscript. A copyeditor is alert for verbosity and can suggest ways to eliminate it. Copyeditors will also point out sections that seem redundant or unclear. The final decision on such suggestions, of course, rests with the author.