Yes, 100n.
D3 is there to raise the minimum control voltage above 0v. The VCO behaves oddly at the extremes and nosedives to glacial speed near 0v.
D4 and D5 create a dead zone for the bend pot mid position to make it easier to set a "normal" frequency. D5 is Schottky to let the maximum control voltage go a bit higher to better equal the minimum *. You may not care and just use the same as D4.
Clock TP is a test point output to measure the frequency. R14 actually helps reduce ringing on the scope waveform due to probe inductance.
* My application is clocking an MCU that can run up to 20Mhz (not that this VCO can run that fast). Your application might crash if clocked too fast. IIRC, this should reach 8Mhz max.