Sooooo.... we download tonight 8x04 and we watch it tomorrow, meanwhile...
1) Correct, regular undead don't come in waves, we can argue about subtype.. but i never think about the bluw glimmering eye thing! you are damn correct, where are the blue light? this is the most bigger hole someone ever pointed out on the web, if you ask me!
2) Chivalry move was sad, butl obligated: if they reman still they lose mobility, they cannot flank (it's dark and they don't know dimension of the other front) and cannot use shock tactics, becouse shock tactics relay on terror and undead have no fear (and no int or fear save :P)
so they simply hope they walk like a stupid walk of the dead horde, in that scenario chivalry run was a good move... sad strategy is a game for two and the King played better on that side.
3) true, they have the advantage of terrain, and use it not how much i think, only excuse was they were in a rush, but still terrain knowledge could be crucial and they dropped that advantage, if it was not for Grey Worm the retreat can be a disaster. i personally use some dragon dlass "triboli" (don't know the english word for that, sorry) and taken all over the battlefield with a short distance siege machine use, to they can lost a lot of troop just by running of it..
4) the primary requisite of the face trick was that you can only use dead man face, so ask Arya to wear Bran face equals ask her to kill him, btw this is the good news, Arya is a OP chacachter and don't need this epic godlevel bless ๐