The facility offered by disordered glassy crystals to study their ordering phase transformation in real time is used to discuss two unusual finite size effects. The first is the change in the overall transformation kinetics observed when the crystal size competes with a length scale characteristic of a nucleation and growth process. It is shown that this can be used to determine the nucleation rate and the critical size at any temperature. The second is a transient reversion of the order detected in the glass transition temperature range by which the transforming system goes back to its metastable disordered state. It is shown how this phenomenon is correlated with the size of the nuclei produced during a sub-T-g annealing.