It threw me off track. When they were debating on whether or not it was safe to find a planet for Apollo to live out his remaining days, I thought the Holodeck was going to come into play. I figured they would somehow use it to give Apollo the illusion of a settling on a planet.
I have no idea why it was even in the episode other than to establish its existence for possible use in a future story.
Yeah, it's a Chekhov's gun failure. By introducing it the way they did, it should have been important, but it wasn't.
That doesn't mean I didn't thoroughly enjoy the episode. But I can see room for improvement with the next.