Some of the closest stars are annotated, and you can click to learn more about them. The "tour" option also offers some facts as you move along. Maybe the most interesting tidbit: Voyager 1, the farthest man-made object, is 17 light hours away. That sounds like a lot until you see it in this context.
A little cheekily, Google also left this message regarding scientific accuracy:
Warning: Scientific accuracy is not guaranteed. Please do not use this visualization for interstellar navigation.