Through The Looking Glass both embodies and satirizes Victorian values. Alice is both the model Victorian child and an example of how the rules of Victorian society are nonsensical and arbitrary. There are several examples.
For instance, Alice's encounter with Humpty Dumpty highlights this nonsensical quality and focuses on language as a key element. Humpty's self importance and Alice's deference to him are part of a larger critique of Victorian society, but it is his "interpretation" of the Jabberwocky poem, in which he authoritatively defines nonsense words, calls into question not only the self-importance of intellectuals but also the meaning of texts themselves (including the one he appears in).
Another example can be found in Alice's dinner with the Red Queen, in which she is introduced to a leg of mutton, only to be forbidden from eating it by the Queen, who insists that you can't eat "anyone you've been introduced to." The Queen, as the symbol of moral authority in the book, is shown to be a hypocrite. She criticizes Alice's manners and permits others to criticize her too, while her own manners are barbaric in the extreme. The same goes for Victorian morality, Carroll suggests; like many Victorian children, Alice is told to "do as I say, not as I do."