Normally I get some variation on "yeah, well, that was OK after x weeks off, you're fine to fly solo now". Is this because I didn't miss any of my mistakes, or because the instructor reckons that my residual error rate is reasonable and safe for a low hours PPL?
I don't know quite how to put this. I rarely see anyone "screw up". That implies doing something that would be likely to be fatal. Even "make mistakes" is ambiguous. Few of the people I fly with are perfect. Come to think of it.....neither am I!!!
So what I - and I'm sure other instructors - are looking for is whether someone can fly safely enough to carry on....and then improve by themselves. For instance, is not being able to keep your altitude within 50 ft a mistake? It depends on your point of view, your level of experience, the weather conditions, etc etc. But does it matter if someone can't do it? Generally, not in the least, from a safety point of view.
So your instructor is probably looking at the whole picture of your flying, rather than the number of mistakes, which I suspect is why you get the reaction that you do.