Try to get a fair mix of male and female employees from various age groups and cultural backgrounds. Don't overlook the potential for future personnel changes. A successful video project can turn sour if a former employee who appears in the video decides to sue. Ask all employees to sign forms relinquishing their rights to distribution and usage. Your production company shuld have a standard form that you can use or adapt.
Timing is everything.
If your company is changing its logo or corporate colors, or is remodeling the building, or any aesthetics that may appear in the video, postpone production until after the changes are made. Nothing makes your video more obsolete than yesterday's image. It is important that you, or a designated person, bo on-site during shoots. As a first-timer to video production, you may not understand the editing process. Ask the production company to include you at the crucial times.