There's a scene in A New Hope that is, in retrospect, unlike any other in the original trilogy. Aboard the Death Star, various Imperial leaders discuss what to do with the Death Star, and they all have different agendas. To put it less delicately, they downright bicker: General Tagge is worried that the Death Star genuinely does have a weakness, Admiral Motti wants to blow stuff up, and Darth Vader just wants to choke the arrogance out of Motti, all while Grand Moff Tarkin tries to keep everything in order. In a movie filled with laser swords and magic powers, this scene looks damn realistic, with the different agendas of various characters coming to a head all at once.
In Rogue One, the bitter back-and-forth between Director Krennic and the Uncanny Valley CGI of Grand Moff Tarkin helps to foreshadow this nicely. Tarkin is eager to blame every error on Krennic's incompetence, while Krennic the career man is just worried about keeping control of the project…so worried that he even steps on Vader's toes. Not only does this foreshadow the bickering in A New Hope, but it arguably foreshadows the future fall of the Empire. In that same scene in A New Hope, Tarkin casually mentions how the Emperor has dissolved the Senate and now "The Moffs and the Grand Moffs will now have direct control over their systems." When questioned about how the Empire would maintain control, Tarkin simply asserts that "Fear will keep the local systems in line. Fear of this battle station." It seems the Emperor gambled on the Death Star alone helping rein in these different military fiefdoms, and the loss of the battle station meant that every leader wanted to go in a different direction…something both dramatized and foreshadowed by Krennic and Tarkin.