One rather obvious example of using stock footage that I noticed recently was when the same hot (but expensively dressed) blonde appeared in ads for two different shopping malls--one of which was still under construction, so she obviously couldn't have shopped there yet.

By the way, I think it means something about the way that the average man and woman thinks that these ads for shopping malls feature expensively dressed babes, but no studs. What it does mean, I'm not sure.