Engine Rattle on Startup

This morning I went to start my Prius (2015 Toyota Prius Liftback 5D I4 Hybrid) and it made the same noise as in the video below (not my video, credits to the original uploader):

I turned the car off and back on, it was still there but way less violent. Turned it off and back on a third time and no noise, and the car drove fine. The CEL did not come on, nor did any other indicators. I've searched the forums and see where this was an issue for the early Generation 3 models (typically the 2010 and 2011's), but didn't see any posts for model year 2015.

On Sunday I did start the car, move it about 10 feet, and then turne it off almost immediately after the ICE kicked on, which based on the posts that I have seen state that doing this can cause this exact issue.

In your opinions, is this like the same issue experienced in the 2010/11 model years or possible something different. I purchased the car in August 2015, and it has about 9K miles on it. I plan on taking it to the dealer, I'm just wondering if it's safe to drive until i can get it there.