Order of Magnitude does a nice job working Musk's face and voice into the scene, which originally showed a stomach-turning spaceship spin maneuver. The video includes footage of Musk from his infamousin September.
Interstellar's a dystopian tale where astronauts travel through a wormhole in search of a new home for humanity. It's entertaining just seeing Musk in a spacesuit in place of star Matthew McConaughey, but even better when he drops lines like "There are many, many simulations" and "I'm tripping balls here."
With Musk estimating that he has a, it's possible we may see the SpaceX entrepreneur in a spacesuit for real some day. In the meantime, we can enjoy his starring role in Interstellar.