Continuity mistake: In chapter 11 when Brutus goes out to take a morning bath and he hears the soldiers cursing over the cold water, the text says Julius rather than Brutus. An error, considering Julius is in a different part of Greece.
Continuity mistake: When Cleopatra is giving birth, Brutus asks Julius if he was as nervous when Cornelia gave birth to Julia, and Julius says he can't recall. However Julius didn't even know he had a daughter until Julia was several months old, and Brutus was the one to tell him. It's not likely that they would both have forgotten this.