This is the first episode where all four wolves are together.
When Darcia holds Cheza up by her throat and she emits what sounds like a supersonic cry, all the wolves are able to hear her, but Toboe physically reacts by covering his ears and yelling as if in pain. This is because he has the most sensitive hearing out of all the wolves.
The scene where Toboe slips while running on the big pipe is similar to the one with Gehl back in episode 1.
Hubb: You'll feel better in no time, and when you get out of here, we'll go celebrate. Our anniversary's coming up.
Cher: But we were married in the summer; and besides we'r...
Hubb: (tsk-tsk) I meant the one for our divorce.
Kiba: Everything dies, it's a natural part of life. But if life has no purpose then your dead already.
This episode aired in Japan on January 20th, 2003