Video is the design service where a thin brief costs the most. A crew day is expensive, and anything you forget to shoot means booking another one.
Watch the reel for product, not atmosphere. Moody brand films are easy to admire. Look for close, well-lit shots of small products where texture, scale and use are obvious. If every clip is people and landscapes, you may be looking at a strong filmmaker but not a product videography team.
Ask who's actually on the crew. A quote can mean one shooter-editor, or a director, camera operator, lighting technician and stylist. Both can be right for different jobs. Know which you're paying for and who turns up on the day.
Agree deliverables by format and length. List every output before the shoot: the main product video, a vertical edit, a short loop, a silent version for the product page. A crew can only cover what it knows it needs to frame for.
Send more product than you think. Liquids get poured, boxes get creased, labels scuff under hot lights. Ask how many units the crew needs, and keep a few pristine hero units unopened until the camera rolls.
Settle music and talent rights in writing. Music licensed for organic web use may not cover paid ads, and a model release for social may not cover a year on your homepage. Ask what each licence covers and for how long.
Red flags. No shot list before the shoot. A single price with no breakdown of crew, edit rounds and music. A reel with no product work. And no questions about where the video will play on your store.