how to deal with incorrect speaker introduction at conference
In case your name is pronounced wrong, just let it slip. You cannot expect someone to know all of the correct pronunciations of strangers' names.

As for the title, I would recommend to only speak up when you are introduced with a status higher than your real one. A side remark like "Oh, and I do not actually hold a PhD" should be enough to clear the confusion and to show people you are not adorning yourself with borrowed plumes (taking false credit). Any further would probably unnecessarily embarrass the speaker.