What kinds of themes can I compare with both "Alice's Adventures in Wonderland/Through the Looking Glass" (novel) and "The Princess Bride" (film)?
I think that there are several areas to which one can point. The idea that both settings are different worlds could be one staring point. The worlds of both are different from modern reality and comparing their settings would be a strong place within which to begin. There are definite evil figures in both. Prince Humperdinck in Goldman's work and the Queen of Hearts in Caroll's might also be good points of comparison in how they endanger the protagonists with their rules and orders that seek to enhance their power, while taking others' away. I would probably focus on the notion of the quest of Alice and Buttercup/ Westley and examine how they are similar. Both characters are ordinary people thrust into extraordinary conditions the quest makes them almost superhuman in what they have to endure. Finally, I think that the characters that are met along the way of their quests might be another good point of analysis. The side characters in both Goldman's work and Carroll's help to bring out the unique nature of the protagonists' quests.