p. 57 Gordita Beach = Manhattan Beach. Where Pynchon lived while writing GR (and maybe CofL49): http://www.theaesthetic.com/NewFiles/pynchon.htm
from earlier somewhere: The phrase "Carpenter Gothic" was in the text (you can look it up!). This is an allusion to a later novel of Wm. Gaddis's, "Carpenter's Gothic."