The episode was seen by an estimated 3.41 million household viewers and gained a 1.7/4 ratings share among adults aged 18–49, according to Nielsen Media Research.
The precinct is visited by Lt. Miller (Dan Bakkedahl) from Internal Affairs, who is investigating a mole who has been passing information to criminal organizations.
Terry becomes paranoid when he worries about the future of his daughters after finding out that a dealer in the disco attended their school, but Rosa reassures him that they will turn out well with him as their father.
After working with Holt all night to catch the mole, Jake finally realizes that Miller is just in the precinct to get information for Wuntch, as she can't access it.
In its original American broadcast, "The Mole" was seen by an estimated 3.41 million household viewers and gained a 1.7/4 ratings share among adults aged 18–49, according to Nielsen Media Research.
"[4] Allie Pape from Vulture gave the show a 3 star rating out of 5 and wrote, "'The Mole' is dead-set on pushing several different plotlines forward, but it may have bitten off more than it can chew for one episode, as a lot of the jokes this go-round feel tired.
Even the overall premise is based around a cliché: The 'somebody's been lying and everyone's under suspicion' episode is a long-standing tradition in sitcom culture, one that's been yielding diminishing returns in recent years.
"[6] Andy Crump of Paste gave the episode an 8.4 and wrote, "There's a lot to laugh about here - Samberg's climactic 'whaaaaaaaa' and Terry's headphone check in the silent disco in particular, but Melissa Fumero's line-read of her texting history with Gina is probably the funniest non-Braugher moment 'The Mole' has to offer.
But more than that, 'The Mole' reminds us of just how good the show can be when it puts one of its supporting troupe members on center stage, and lets Samberg sit in the passenger seat.