The episode title, ‘The Odd Couple’, rather gives the game away that one of the week’s plots will be the consequences of Murtaugh sharing Riggs’s trailer while he and Trish are at war. Riggs is keen for Murtaugh to go home; Murtaugh, however, isn’t willing to apologise to Trish, and things are made worse when a murder suspect requires to be arrested at a public event related to Trish’s work. As a result a key client withdraws from a huge deal, although Riggs persuades him to hang around by promising him the best barbecue he’s ever tasted. As this is a reference to Molly’s barbecue, Riggs needs to go cap-in-hand to Molly, who, quite rightly, isn’t in a forgiving mood. There’s an eye-rubbingly absurd stunt towards the end, when Riggs and Murtaugh jump out of a plane without a parachute but manage to survive, which is of a piece with a sparky but ultimately inconsequential episode.
Edit: The latest, and on the face of it most comprehensive, piece unravelling what went wrong.