Hi,
The tweeter and lower woofers are flipped polarity, you can either flip the polarity at the crossover, or at the driver(s).
For most people, it's easier to flip the polarity at the drivers rather than at the crossover.
When you flip the polarity at the drivers, the red wire will go to the smaller negative terminals, and the white wire will connect to the larger positive terminals.
The 0.68uF Sonicap is to further improve clarity of that bundle of Sonicaps. It discharges faster than the large caps, and it acts as a siphon, allowing the big caps to discharge faster.