That isn't going to change oil pressure because the pressure depends on the pump pushing a volume against a resistance. You can't add or remove oil and change oil pressure at idle. Consider it a fluke, unrelated to 1/2 quart of oil in the pan.Got the extra half quart in, only difference that is measurable is the oil pressure now sits at 30 on idle as opposed 27 but I know that means nothing in the grand scheme of oiling the engine.
I guess we each have our own methods for preventing "problems".Worrying about the same oops, I usually stay under the vehicle waiting for it to drain then replace the plug before doing anything else. And it's OK by me if it is still trickling slowly when I put the plug back in. I still got 99.9% out.
Fixed.Good news is you passed the interview process for Iffy Lube.