[Bender explains why he drinks so much]
Bender: Nah, I'm trying to watch my input. I need plenty of wholesome nutritious alcohol. The chemical energy keeps my fuel cells charged.
Fry: What are the cigars for?
Bender: They make me look cool.
Why he use "They" but not "Its"?
Is it a mistake?
In addition:
Leela: "What if I just help the two of you find a bigger apartment?"
Bender: "I don't know...I've got a lot of great memories of my old place." [pushes button]
Bender: "And now they're gone!"
And why does he use "they" for "memories"?