The name of the bar, "The Dead Drop" , is a term of art used in Intelligence Circles. It is a way for Agents, or Intelligence Operatives to exchange information in the field with their Agent Handlers without risking an in-person meeting.
The title of the series "Whisky Cavalier" (or Will Chase), seems to be a variation of the phonetic alphabet, namely Whiskey represents the letter W and Cavalier represents the letter C ( which is normally represented by the word Charlie).
Series trademark: each episode, the team travels to another country and a cover of a classic English-language pop/rock song in that country's language will be part of the episode's soundtrack. For example, when they went to France a French version of "I Got You Babe" played and when they went to Spain there was a Spanish version of "Happy Together."
ABC's Whiskey Cavalier was a surprise, last-minute cancellation by ABC in May 2019, much to the consternation of a vocal contingent of loyal fans who felt the drama deserved more than a one-and-done. The cancellation was also surprising in that it had been touted as one of the big shows of the season for the network, featuring some hot stars and experienced showrunners. The network cited low ratings and not much room to grow in its decision. Distributor Warner Bros. is shopping it elsewhere, but nothing has happened yet.
The trivia item below may give away important plot points.
The title "Whiskey Cavalier" is protagonist Will Chase's FBI codename, which comes from his initials WC. This code name fits both his personality and the overall feel of the show because to be "cavalier" is to be "Carefree and nonchalant; jaunty." Frankie Trowbridge's initials FT become her code name "Fiery Tribune," and she definitely has a fiery/angry personality, while a tribune can be a trial (or a difficultly).