The K'Hund in this episode is possibly of the same race as the Khunds from the comic book version of the Legion of Super-heroes.
This is the highest rated episode of this season so far.
Cat Grants microphone appears and disappears throughout her interview on The Talk.
The firefighter that thanks Supergirl on the roof right before she is exposed to the Red Kryptonite is the same firefighter that saves her from Livewire when she and Banshee attack Cat.