And Then What?: At the end of "Carnage of Krell", a dejected Rex and Fives discuss the war. When Fives attempts to cheer Rex up by pointing out that the war will eventually end, Rex wonders what will happen to all the Clone Troopers once it does. Fives does not know and cannot think of anyone who does.
Shoo Out the Clowns: Ahsoka doesn't appear in this story arc at all, presumably because it's so dark and serious that she wouldn't fit well with it.
War Is Hell: The battle featured in this story arc is among the harshest battles presented in The Clone Wars.