As the name suggests, being called a "cardinal" must meet two conditions, "(wearing) red" and "bishop". Careful people will of course see that someone in the film is obviously wearing black clothes instead of red. So they don't meet the "red clothes" condition. These people are generally cardinals of the Eastern Catholic Church. An example is the current Coptic Catholic Patriarch of Alexandria, Card Antonius Najab I.
Not all of those people are "bishops", such as Cardinal Peter Tucson, president of the Pontifical Commission for Justice and Peace, who once participated in the election of Pope Francis, then and now is not a bishop. He is still eligible to elect the Pope.
About a third of those now eligible to elect the pope are not "cardinals." But these people still have a common title, "cardinal".
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