Re: Tape?
That's why it's called Science Fiction and not Future History. And even the best make mistakes :-)
Sure, but in the case of Clarke, he is (or used to be) lauded as a visionary, and in some of his non-fiction writings (some passages in "The Lost Worlds of 2001" come to mind) he even congratulates himself on getting predictions right - so pointing out things he did not get is fair game, more so than in the case of other science fiction writers. (Said in a good-natured way: I am actually a Clarke fan, and as a teenager read almost every story by him I could lay my hands on...)