[george_morgan]

Well, there was a politicised line of thought in 20C modernist typography towards abandoning capitals due to their implied hierarchies. Herbert Bayer’s experimental Architype (http://en.wikipedia.org/wiki/Bayer_Architype) would be one example of a specific typeface designed with this in mind, but there were also many other typographic designs of the time which abandoned capitalisation.

We’re still seeing the filter down of these experiments now, every few years another company rebrands and drops their capital letters to “humanise” their image or some such reasoning.

So… maybe it was a conscious decision by the author along these lines. Or as you say probably just a broken shift key.