A character's phone number is shown to be (310) 742-3046. (To avoid a spoiler, character is not specified here.) 310 is a real area code in Los Angeles, the show's setting. An internet search for that fictional phone number produces multiple pages of listings for Cash Loans of Nashville, which has 742-3046 as its telephone number, but of course with a different area code. However the company's street address is the same as the fictional phone number's area code, 310.
When Britten is describing the suspect to the motel manager, he says, "keeps himself to himself," which is the British version of that expression. An American would say, "keeps to himself," but the actor, Jason Isaacs, is a Brit playing an American.