this is hard to see for PS because we don’t see the fringes in the interferogram as clearly as in tradtitional DInSAR approaches, because the PS are connected by a network.
Here is an example where the unwrapping produced errors (phase jumps): Basic Subsidence Formation
These are not as clearly visible for PS, but you can plot all interfefrograms and check if there are patterns in single ifgs which are not contained in others. This can also be due to atmospheric disturbance, but still considered a potential error.