He helps Chuck remove the foil from his walls and finds a copy of The Adventures of Mabel, a book that the brothers read together during their youth.
Mike Ehrmantraut drives away from the location where he tried to kill Hector Salamanca[b] and unsuccessfully checks his car for a tracking device.
While looking at a sales display of gas caps, he has an epiphany and takes apart the one from the station wagon, where he finds a battery-operated tracker.
After finding the tracking device, Mike obtains an identical one from Dr. Caldera, studies its function, and discovers it remotely warns the operator when the battery runs low.
The site's critical consensus reads, "Odenkirk and Banks carry their respective portions of "Mabel" with ease and innuendo in an episode that enlivens its familiar aesthetic with a peppier-than-normal pace.