I think I figured out why he has two pairs of eyes. To see under the brim of his hat when he tilts his head x)
I'm somehow sure that Zestial would have rather perceived Velvette's actions more with indifference and silent dislike. Even her attempts to scare him didn't give him any reaction (although in the series he reacted for some reason). Zestial's a grandfather who's a many centuries old. Why should he be surprised by a little booger? x)
No idea who the birds were, but I found them more interesting than the weird blue light fixture x) And I think if these birds were at the meeting, they'd still be sitting next to the dinosaur, as they were more or less close in height to her(I guess). And the shorter overlords would already be sitting closer to Carmilla so she could see them x)