I love that when Riker is sent to turn out the lights on the alien, he announces - "dimming lights; Now!" From now on whenever I am retiring to bed for the evening I am going to announce this Rikeresque. "Turning off lights; Now!" Ha ha I loved this so much I cannot stop thinking about it. In fact it's all I can really remember from the episode! Was there not some lowly Ensign nearby that could turn off the lab lights? They had to send the Executive Officer from the bridge to turn off the light?!
The only other observations I'd like to add is that at its heart this is another interesting sci-fi concept episode (lots of these in the first season) - Terraforming and a "life, but not as we know it". Oh, and the wires to make the "creature" light up are so visible in HD. Never noticed those before.