Beatles fans got a special treat on CBS Monday night — a stand-alone Carpool Karaoke episode featuring Paul McCartney. After filming in Liverpool with the music icon, The Late, Late Show with James Corden producers decided they had just too much great footage to let it go to waste, so they decided to put together a special prime-time episode in addition to the original, shorter “Carpool Karaoke” segment that aired as part of The Late, Late Show.We worked with Inscape, the TV measurement company with glass-level data from a panel of more than 9 million smart TVs and devices, to examine viewership trends around the special.Tune-in was fairly steady across the broadcast, with dips that typically correspond to commercial breaks (when viewers are more likely to check out other shows).And speaking of other shows, for those households that did tune away during the airing, they were checking out news broadcasts and shows including Salvation, Elementary and American Ninja Warrior.When it came to viewership crossover, 31% of people watching the karaoke special had also watched The Late, Late Show with James Corden in the last three months, but among regular Corden viewers, only 8.3% tuned into the Carpool Karaoke special.This audience clearly enjoys other late-night shows; topping the list of other series watched are Late Night With Seth Meyers, The Tonight Show Starring Jimmy Fallon, Jimmy Kimmel Live and Saturday Night Live.And finally, a look at the location of households who watched this special, plus regular Corden episodes. In the heatmaps below, the darker the color in the graphic, the more households were tuning in. For more data insights, subscribe to our newsletter.