After Kirk is summoned to Sickbay and on ordering Spock to use the manual controls to open to malfunctioning door, Nomad is shown coming through the same doors (which were labelled "Leonard H. McCoy") but the background of that shot indicated Nomad was in a turbolift, not Sickbay.
Immediately after the credits as the episode title is displayed, the exterior view of the Enterprise was black and white.
During the teaser when the Enterprise is hit and everyone on the bridge falls about, the entire forward navigation/helm console can be seen to lift up as the navigator and Spock fall against it.
After the first of Nomad's energy bolts strikes the ship, Spock comments that the shields absorbed energy equivalent to 90 of the ship's photon torpedoes. Clearly, the Enterprise survives. But a few minutes later, the Enterprise hits Nomad with a single photon torpedo -- which it absorbs. This prompts Kirk to wonder with amazement how anything "could absorb that much energy ... and survive". But his own ship did far better.
How can Spock mind-meld with Nomad? It is not a sentient being; it's a robot. Unlike Data, Nomad was created for a specific purpose, a purpose that didn't require the ability to think or learn. It retained this state when it crashed into and absorbed the alien probe, albeit its programming changed to reflect its new nature. Thus, it shouldn't be intelligent or self-aware enough to warrant a mind-meld.
You can see the string that holds Nomad in the air.
It's not clear exactly what Nomad does to Uhura. Still, they're able to re-educate her in a week in this episode. When Spock has to be reeducated in the fourth Trek movie after his death and rebirth, it takes 3 months.
In a mind meld, as we see in previous and future episodes, both participants share thoughts and memories. That doesn't happen when Spock mind melds with Nomad - otherwise Nomad would know Kirk is lying.
Nomad was created from the amalgamation of two probes - one that was sent to search for alien life, and one that was designed to collect and sterilize soil sample. What gave it the power to destroy planets and fire bolts with the power of 90 photon torpedoes?
When Nomad initially attacks the Enterprise, Uhura appears/disappears in subsequent shots of the bridge.
Nomad: (describing the human body) Insufficient safeguards built in. Breakdown can occur from many causes. Self-maintenance systems low reliability.
McCoy: Man is not just a biological unit that you can patch together.
[Speaking to a robot, referring to Uhura]
Spock: That "unit" is a woman.
Nomad: A mass of conflicting impulses.
Spock: Captain, I congratulate you on a dazzling display of logic.
Kirk: Didn't think I had it in me, did you, Spock?
Spock: No sir.
Spock: Captain, your logic was impeccable; we are in grave danger.
Desilu No: 5149-37.
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