We learn that the Vissians have discovered at least 200 natural occurring elements, we currently know of only 92 natural occurring elements
	When Trip secretly goes to meet with the cogenitor, he tells the Vissian engineer that he's going to the mess hall. However, throughout the rest of the episode, everyone (including him) seems to think that he claimed to be going to Astrometrics.
	Malcolm says he has never heard of 'photonic warheads'. In "Sleeping Dogs" he gets his hands on and launches the Klingons' photon torpedos and torpedos have... well, warheads.

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