When stories don't work in a presentation
One of the speakers continued to use stories, but started a few by saying, "This happened in the 80's." Telling your audience that your illustration comes from over 20 years ago does not inspire confidence. Is it because the ideas only worked once so the speaker doesn't have any more recent examples? Is it because the ideas no longer work today? I'm not sure, and so I discounted that point. And it gave me cause to be concerned about the other points as well.
Stories are a great way to illustrate your point, but make sure they are focused properly. Use recent examples that everyone can relate to and see that it is relevant to today's world. Use examples of similar situations that they might find themselves in so they can relate to what you are saying. And remember that the presentation is all about the audience, not about you the presenter. If you need the audience to know about your credentials, put it in your introduction, not the opening 15% of your presentation.