Fortunately, there was terrific communication between all of the filmmakers, as Joe and Anthony Russo were able to discuss the depiction of Wakanda with Black Panther director Ryan Coogler, and sort out Taika Waititi’s reinvention of Thor in Thor: Ragnarok, which also proved problematic to crafting Infinity War’s introduction.
Maintaining continuity in a shared cinematic universe is hard – just ask those involved with Avengers: Infinity War, which was one of five Marvel Cinematic Universe chapters being made concurrently in the late 2010s.
Writers Christopher Markus and Stephen McFeely went through several drafts of the opening scene even before the conception of 2017’s Ragnarok, which fans know has a mid-credits scene that directly informs what arrived a few months later in theaters.