Do I need to make a bank deposit on the same day as my Non-Imm O visa extension appointment?

Yes

When you get out there SHOW the tall thin immigration guy that runs the zombie horde queuing up outside the door in the morning the print out of your appt.

Usually I tell people NOT to make appt's right when they open because you have 200 people trying to get in the door at 8:30 when they open and an 8:45 or 9AM appt is far easier as you just skate in

BE that as it may

That tall skinny immigration officer guy whose manned the entry doors for years WILL put you to the side and let you get in ahead of the horde when he sees you have a printed appt for 8:30.

you don't get a queue, you just go straight to section L1 and then to the first cubby on the right where it says "document check", they will check the documents, get them in the correct order, then send you to the correct cubby for the online appt extensions

Yes, you must update your passbook on the exact day of application and make a copy. Check your bank if they have a branch or atm/pum at Chaengwattana Building B. You can do it there before you go into the immigration office.

You need to update that bank book so it has the balance the date you apply and make a copy of that last page too

So if that means you need to pull money out, or put money in to make your bank book update when you put it in to bank book updater machine then that's what you have to do.

Don't worry about the balance not being what the bank letter or detail transaction print out says, there's no requirement those numbers match at all, just do what ever you need to so you can get the balance to print on your bank book the day you apply for the extension 🙂