Continuity mistake: When Lawrence writes his own name on the ballot, his hand switches position in close-up. (01:32:50)
Continuity mistake: Lawrence sits on the late Pope's bed and looks at the bedstand. In close-up, the position of the objects on it (breviary, lamp, case) slightly changes. (01:21:20)
Character mistake: The official in charge of announcing the voting results keeps pronouncing Cardinal Adeyemi's name in different ways; he puts the accent on the last "e" the first time, then the French way on the last "i", then mere seconds later the "e" again. Considering Adeyemi already walked in the conclave as one of the 4 favourites, and that utmost care was put in the preparation of the ceremonial (in an earlier scene, Ralph Fiennes' character makes sure he knows how to pronounce the name of one of the unimportant cardinals), it's quite the egregious mistake that he keeps repeating. (00:44:20 - 00:44:50)
Continuity mistake: Lawrence is pondering the situation after the shocking revelation about the new Pope. He spots on the floor of the chapel one of the papal turtles. The animal is on a different part of the marble floor between shots. (01:50:50)
Continuity mistake: The first evening, the supporters of Cardinal Bellini are discussing his chances on the first ballot and the work ahead. They are interrupted by the nuns opening the door. In the shot where they close the door, some cardinals have changed position all of a sudden. (00:26:50)
Continuity mistake: At the table of the Italian cardinals, Lawrence calmly paraphrases Cardinal Tedesco's claim that the next Pope should be from Italy. Sergio Castellitto drinks from his glass, out of focus in the foreground. He then distances the glass from his lips, fully extending his arm. However, in the reverse shot, his glass is still close by. (00:25:10)
Continuity mistake: When Tremblay tells Lawrence that he delayed him being called to the Papal residence because he wanted to ascertain all the facts first, the folder in his hand suddenly opens between shots. (00:06:50)
