Did you undo the top hose that goes to the engine? If I remember correctly, you undo the clips and the top hose. Lift the front part of the airbox lid and the then it comes off. There is some type of "hinge" on the back side.
That Z cut off is normal. It is created by a cut off shield inside the projector. It enables for the output on your side of the road to be as big as possible(higher) while the output on the oncoming side of the road is a bit less(lower) so you don't blind oncoming cars.
I would return the entire kit and get one without the anti flicker things. I have never used any anti flicker items on any of the Hondas I've owned(4 different Honda cars).
My 06 Si had the whine....I wouldn't be worried about it, but being a mech, I could see your gripe.
I think its just the angle of the pic and not actually blacked out window trim. But yes.....would be better to black it out.
Amazing how the spoiler and quad pipes makes the rear a bit better to look at.
The tail lights on the white one are better but they def do not look like the sedan tail lights.
From the @HondaPro Jason instagram page....
Prob a non US model since the Fit is/was offered as an RS model.
Black grill is a plus as well as a wide spoiler.
In other non important news, saw a silver 16 sedan in the wild. That color does wonders for the rear. Not sure why but looked...