One of my favorite episodes of TNG for no reason other than the shot of Picard playing the flute with some other actors hands operating the instrument holes. When I realized they weren't his hands I couldn't un-see "Muppet Picard".
It is the image I posted. I might be misremembering, maybe it was the from the other episode Inner Light. After that point though, I was constantly on the lookout for more Muppet trek. There was one shot of Riker that was a bit suspicious. 😁
I didn't even see that! I was just reminded of the other, more obvious shot. I might never be able to watch another movie again without being suspicious if the actors elbows are offscreen!
I saw that roll-up piano she's playing in this episide when I was a kid and I was in love with it. I don't even play piano but the idea of flexible, roll-up electronics stuck with me over the decades.
Looking outside the ST universe, I'd say the perfect "breather" episode for a series would be Doctor Who (2005) S03E10 - Blink. 3 minutes of recording from the primary talent, and the entire rest of the episode is done by extras and every moment of it is engaging and extremely well done.