Guy Ritchie rewrote the script when he came on board but he also actively encouraged his cast to improvise as much as possible. Aubrey Plaza was particularly pleased with this style of direction.
Hugh Grant is seen cooking steak at a barbecue table that is almost identical to the one featured in one of his scenes from Guy Ritchie's The Gentlemen (2019). Ritchie is known for his obsession with barbecues and outdoor cooking. He personally had a hand in the design of the tables.
The French military idiom "ruse de guerre", sometimes translated as "ruse of war", literally means "war cunning" or "combat trickery".
Orson is offered one of two swipe hotel keys by Nathan, played by Cary Elwes, who was in The Princess Bride (1987). Orson cleverly chooses the key not offered to him, saying it's probably the better room. Nathan then jokes that he could have already switched the hotel badges, predicting this challenge and attempt at thwarting the ruse. This is a throwback to a scene in "The Princess Bride" featuring Elwes's character, Westley, Wallace Shawn's character, Vizzini, and choosing potentially poisoned wine glasses.