This past שבת, after the shul's official מנחה, I was sticking around to learn a little when a group from a בר מצוה came in and started another מנין. They didn't really have someone to lain. I happen to know the first עליה of ויצא but there was someone else who "offered" so I let him do it. He definitely ran into some difficulty which I do not fault him for. But then he said וַיִּיקַץ יַעֲקֹב מִשְּׁנָתוֹ וַיֹּאמַר - instead of וַיֹּאמֶר. Yes, imagine the horror! Unfortunately, someone in the crowd had the audacity to call out the correction - and he was quite adamant about it. I tried my hardest to drown him out and assert that it made no difference and he should just go on. But he actually went back and repeated the entire פסוק. It's bad enough to make such a correction under normal circumstances. But certainly, when the בעל קריאה is already nervous because he does not know it so well and is up there as a last resort - these corrections are more than unnecessary. I really wanted to go up to the "correcter" afterwards and kindly explain that the difference between וַיֹּאמַר and וַיֹּאמֶר is about the same as the difference between מִצְרָיִם and מִצְרַיִם. But I could not gather the courage.