As the subject line says, wildly off-topic. But some-one here might know the answer, and it’s been bothering me.

Such are my failings, I’ve been watching the second series of “Halt and Catch Fire” in order to catch up with what the kids are up to these days. In the second episode one of the characters opens what looks like a copy of K&R first edition, but the cover is blue. I thought that the colour correction on my TV might be deceiving me, or possibly the vertical hold was on the fritz, but he did it again in the third episode, and the cover was still blue.

So my question is, did there ever exist an edition of K&R in that colour scheme, or is gcc to blame for the inaccuracy?