Answer from Kyle, PHR:
Yes. If you are recalling some positions, but not others, you should document the business reasons why only those positions were recalled. If you are recalling some employees in a certain position, but not everyone in that position, you should document the objective, job-related criteria you used to decide which employees to bring back. Seniority or previous job performance, for example, would be acceptable criteria and relatively easy to defend if you are ever challenged.