* Think Blue Count One Tow, an allusion to Think Blue, Count Two, a short story set in Cordwainer Smith's Instrumentality of Mankind series.
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* Lain's old computer is reminiscent of a 20th Anniversary Macintosh. It runs a Communication OS, denoted by a large capital C as it's logo - reminiscent of the Commodore logo.
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* The text seen on the blackboard in the classroom is code, written in the C programming language.
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* NeXT (an OS) icons appear on Lain's father's computer desktop.