After you get past the first season, (if you accept the premise of an omniscient, digitally omnipotent artificial superintelligence that oversees the world), there are really very few technical errors.
In the first season, your standard crime-drama tech mistakes apply (malformed IP addresses, someone invading a computer system with a DDoS, randomly placed PCB overlays, etc.)
As the show progressed in to its second and third seasons, I was surprised to see the protagonists' computers sporting GNOME taskbars.
EDIT: There are its fair share of minor discrepancies in various things like shell syntax and code formatting (like using Greek symbols in C code), but the point I was trying to make is that PoI's accuracy was overall very impressive. This impressiveness is amplified when compared with a series like CSI: Cyber, a show which does a far worse job of writing believable technobabble and designing realistic UIs, despite such things being arguably more critical to CSI: Cyber.
Another show that did some awesome science fiction in the last few years was Continuum. A lot of it was heavily based on the concept of corporations (particularly tech corporations) gaining a strong influence in or control over our government. To the extent of having a 'corporate congress'.
In was also amazing that it was a CBS show, given their typical fare.
It's definitely grown into a more story-arc driven show, and the Numbers have become more often than not relevant to the ongoing plot.
Does Keith Alexander speak in the voice of bumblebee from transformers? Is it safe to answer the payphones in Bryant Park? Did Ed Snowden also rescue Jesus from the NYPD? And if he didn't, who will.
Isn't that more a description of cyberpunk than scifi?