This video doesn't give an example of a Vignette

I was curious about that too! I found another example showing the journey map, pain points, and vignettes: IBM Design big idea vignette. The vignettes in that case are collections of sticky notes describing big ideas using a sketch, a headline, and a caption. They encourage each team member to also create one vignette that's completely absurd!

An example of a vignette from that document looks like this:

• One sticky note showing a stick figure wearing a top hat and bow tie carrying a box. The caption is visualized as the speech bubble of the stick figure. It reads: "Here's what you need!"
• One sticky note with the headline "SECURITY CONCIERGE serves up the permissions and admin settings that you need."

The group could spend the 20 minutes documenting their big ideas in vignettes and then discussing them. And/or laughing together at the absurd variations if that's part of the activity. I'm guessing that might not be part of this video because it seems better suited to bigger ideas. With Sarah's journey, many of the ideas are probably closer to features in the interface, like showing a shopping cart button on the site alongside the number of items it contains. Other problems to which you could apply design thinking may have different suitability for vignettes and storyboards.

That IBM example was awesome. It was kinda like....a mothership of clarity UFO's