Missing obvious blunders

I was just reviewing a blitz game I played, and was kind of shocked by the number of blunders on both sides - especially because at the time I thought we were playing reasonably well.

One move stood out. I had an unprotected pawn one row from promotion, and my opponent moved his rook directly into a square it was attacking. Did I take the rook and promote to queen? No, I just didn't see it at all. It was as if I just didn't think my opponent (who had just taken my queen) was capable of making such a bad move.

I'm pretty sure I would have seen it if there hadn't been time pressure, but I'm wondering if spotting the obvious is something you can learn, or if I'm just doomed to be stuck in the 1200 range as a blitz player. FYI, my ranking is 1700 in turn-based play.

It'll come with general improvement, drilling tactics etc. I feel the same way about my blitz play: it's not something I'd do to boost my confidence!

I think that playing faster timers like 1 or 2 minute games will get you use to the time pressure and you will begin to see things better under time pressure... just an idea