Stupidity: In chapter 2, when Luke arrives home he thinks "Maybe she went away?" Tanya says "No, I am in the bathroom." Luke then correctly asks if she can read his mind, and she says that she can't, she just reads the signals human send unintentionally. Which is fair, but she's in the bathroom and she can't see him at that point.
Character mistake: In the "Tanya loves Luke" ending, there's a word missing from the on-screen display ("the" is omitted from "the whole population of London") - the voice acting properly uses it though.
