In this episode Scotland Yard gives Booth a bobble head Bobby, or policeman. It sits in his office for much of the rest of the series after this.
While it's common for US TV shows to set episodes in the UK. Unusually for US TV shows, this episode is actually filmed in the UK rather than on sets built in a US studio with library footage for establishing shots.
Several of the characters are named after British rock musicians: Roger Frampton (for Peter Frampton), the Bonham family (for John Bonham of Led Zeppelin) and Emerson, Lake and Palmer (for the members of the progressive rock band of that name).
Starting with this episode, the position on the "Squint Squad" door seems to be a revolving one as no permanent replacement for the character "Zach Addy" was ever put in place. It should be noted the rotation is "Squints" will, at times, also include Zach himself.
The symbolism that Agent Booth, an American, throws his tea in an English harbor.