I read "1968" as "!986" and when looking at it again, still read "1986"...as in, the mouse was a pretty big deal back in 1986, from what I barely remember. But 1968? My mental picture is just circuit boards and punch cards. How amazing this technology must have seemed.
The interesting thing is how much this was straining technology at the time, and how it predated the innovations (such as microprocessors) which would make this sort of thing not just feasible but inexpensive enough for many folks to make use of it in the home.
The SketchPad demo is just amazing. Whenever I work with a crappy interface I think about SketchPad and wonder how we collectively haven't set higher standards for the way we interact with computers.