Crystal grounds and minimal trace distance to leads
If PCB traces start to approach the length of one tenth the wavelength of the crystal frequency then expect problems. At 32 kHz, the wavelength is 9 km so this isn't going to be a problem. Ditto differences in length. 

When calculating the capacitances to hang around an oscillator you should take into account the capacitance of the tracks - this will usually be a few pF but you can find online trace-capacitance calculators.

I don't see an issue in what you have shown.