Just a couple of things, if the customer is not using the sync line then he must be using embedded codes (BT.656). It's unusual to see a RGB 888 BT.656 source unless it's a custom source.
On note 4, a minor comment. It doesn't matter what order the 0.15uF and 169 Ohm resistor are in. The EXT_LF1/2 pins see the same impedance.
Power rails look good.