Not only have I done this, but one of the pages I uploaded to the wrong series ended up going up while I was on vacation and had no way of fixing it so I had to hop on someone elses computer and delete it really quick, leave an apology to my readers, and make sure the correct page went up when I got home. It's a REALLY good thing no other updates for that series were supposed to happen before I got back otherwise I would have had to delete more than the one, HAHA. A really good example of why it's good to check first ESPECIALLY when frazzled before a vacation.... I double check all my pages now even if I'm 90% sure I put it in the correct spot.
(And in my case I HAD set the pulldown menu properly, but I think I had clicked out of the upload to double check on how I needed to title the page or something like that, so when I clicked back it registered as the correct series in my head, even though it wasn't. I WAS VERY TIRED AT THE TIME)