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Rose (reclining on a couch in a coffee shop, looking up and to the left, bored): So anyway, the only difference is that his kids all have four fingers for some reason, while all the other Na'vi have three.
Rose: I'm not, like, an Avatar geneticist. But I'd expect a Human-Na'Vi hybrid to be, I don't know, shorter? Less blue?

[Camera pans out to show Aya sitting next to her on the couch, looking at her hand.]
Aya: Ok, sure, but...
Aya: Why four fingers?
Rose: Uh, because that's the standard number of fingers for a person to have?

[Aya, skeptical, holding up three fingers and a thumb with her right hand]
Aya: FOUR fingers?

Rose (laughing, holding up her hand): No! Four fingers and a thumb.
Aya (dour): A thumb IS a finger.

Rose: I guess? But you wouldn't say that like, MICKEY MOUSE has four fingers.
Rose: He's got three fingers. The thumb is just assumed.
Aya: Why would we assume that?
Aya: Some people don't have thumbs!