Chances are there isn't one. The reason there isn't one is because the ad was created or generated by someone who didn't really know what the vision and direction of the company is.
Advertising has two and only two functions.
In most cases you will probably go right past their ad without a second thought. Did you ever notice how many tire ads there are in the paper when you need tires. You hardly notice them when you don't. Here are some common mistakes your competitors are probably making. Learn from them.