First, I know people don't talk grammatically correct. That's true for any language, but most common grammar errors are different for each language.
Second, English isn't my first language. So if I read something in a story I'm often in doubt if people really speak this way or if the author just made an error.
Example:
"So are you two are together?"
The double 'are' grates on me, because translated to my native German, no one would speak this way.
I can see how it's an error caused by the author during writing or proof reading.
"So are you two together?" and "So you two are together?" got mixed up.
Could this easily happen in dialogue? Is this how many people speak?
HM.