Previews in spoiler tags.
I recognise so many of these quotes. Giger's "I am on the Alien trip!" is not a reference to LSD per se; he was happy with the production (that week). Holm's quotes are from his autobiography. Giger's from his diary. Rinzler also misidentifies a quote from W.H. Auden. And some quotes from Hill's interview in Back Story IV
, etc. Ridley's quotes seem new.
I'd love to see his other sources.