Other mistake: During Padmé's big speech to the Senate, Duchess Satine is visible in the background watching at one point. Satine is the ruler of Mandalore, a neutral planet, not a Senator, and thus has no reason to be present at a normal session of the Galactic Senate.
Suggested correction: Mandalorian is neutral in the war, but they are still a member of the Republic Senate.
Other mistake: Obi-Wan Kenobi discovers the Mandalorians and gets into a fist fight with them, punching one in the face a few times, who reacts with obvious discomfort. But the one hit is wearing Mandalorian armour, famously resistant to all kinds of weaponry, and Obi-Wan is barehanded! The Mandalorian should be laughing off his attempts. Not to mention that later he surprises another armed guard in Mandalorian armour and knocks him out with two barehanded blows to the helmet.
Suggested correction: It must be pointed out that unlike the Mandos he's fighting, Obi-Wan explicitly has supernatural powers, powers that most certainly help with things like punching out people in full armour. Seeing this as a "mistake" is kind of ridiculous in a space fantasy series.
Trivia: In S5-E1, Savage kills the Jedi with Obi-Wan. However, in S5-E2, she is sitting as part of the Jedi Council.
Suggested correction: I know there was talk about whether this is a legitimate mistake or a trivia entry. The episodes were simply aired out of order. "A War on Two Fronts" was supposed to be the season premiere, but they ended up airing "Revival" instead. On the DVD, the episodes are ordered chronologically, and "Revival" is placed later between what's regarded on IMDb as episode 13 and 14.
Continuity mistake: This all takes place before Revenge of the Sith. Anakin is talking to a holo of a pregnant Padme, but he doesn't find out she's pregnant until he returns from rescuing the Chancellor in that film.
Suggested correction: Just because the audience noticed Padme is pregnant does not mean Anakin did.
Plot hole: Cato doesn't even know who Ord (the person she is impersonating) is, and yet she manages to perfectly imitate his voice and manner. She wouldn't have transformed her own internal organs, since she probably would have ruptured them.
Suggested correction: Quite apart from anything else, Cato is a member of a shapeshifting species, so why wouldn't she be able to perfectly take the form of another species? And her internal organs have nothing to do with the plot of this episode.