My favourite was B5's Passing Through Gethsemane where the computer said it would take something like 6 hours to perform a simple Google search. Also, I got a Kindle Fire for Christmas and it's about the same size as a Starfleet PADD, so now when I see a PADD in the shows I realise just how hopelessly outdated they look. It's not the show's fault, Star Trek was actually quite prescient about the existence of these devices, but it can take me out of a scene for a moment, especially when we see a character carrying multiple PADDs as though each one can only contain a single book.I love little curiosities like that, just to show how far we've come since the episode was made.![]()
I think I at least have a "fanwank" explanation for that.

I figure people finally got tired of the "cloud" crashing, being sabotaged, etc. and taking all their crap with it (or compromising its security), so the reliance on physical media and separate discs increased to combat that in Starfleet settings especially. (That and the whole, "Durrrr, we can't help you or do anything because we don't keep paper backups of anything" thing that I hate.)
(Which should be an explanation kind of reminiscent of what we see on nuBSG with the "no networking" response to the Cylon threat.)