The ones that get pissed off don't get hired again. Use the tips above passerbys and to explain to them what your expectations are and how they are going to handle questions from the customer. The bottom line is that when they're on your time, your company is the one they're permitted to discuss.
For instance, if you are doing a shoot in a company and you hear the Director of Marketing discussing that they need a different video for a related product or service, you should telephone the person that hired you (if they are not already on the shoot) as soon as you get a break to notify them that you just overhead this info.
Talk to your viewer/audience - Your corporate video production isn't about you it is about your own audience. Each question and be relative to your target audience and frame of this video must have this in navigate to this site your mind.
What is Your Objective? What is your video's goal? General info? Advertising and Marketing? Training and Instruction? Entertainment? The only way for your production is to be clear about useful content what you want audiences to do after they've seen your video.
Not everything Michael Jackson did was severe. You can see that he was just having fun being an entertainer. That's how he made his effect on the world.
While blog there are methods of automating some of this. Early in the process cannot beat going to other people's websites that relate to yours. Joining in conversations on forums and blogs, and generally being an advantage to the talks. Using and your name a link back to your site where possible.
Getting your name out on those very large profile sites, setting up - or joining - interest groups. They all will pay a large dividend in the long term.