Wrong side/omitted procedure

Had a question for you all. I recently had surgery and while in the preop holding room, was given a consent form to sign. This consent form had the wrong side and omitted one of the procedures. I notified the nurse of these issues who told me that she couldn't get the consent form changed nor could I speak with the surgeon until I was in the anesthesia room. She said I was required to sign the errant consent form before she could move me down to the anesthesia room. If I didn't sign, I could not have the surgery.

I felt at a loss so I signed the consent form with the wrong side, and omitted procedure, then moved down to anesthesia where I spoke with the doc and got the consent form rewritten and signed (prior to me being given anesthesia).

I had also figured that once I got on the table I could make sure I was positioned to ensure they were doing the correct side, but I was given anesthesia while being wheeled into the room, and my last memory is of entering the operating room, so I was out before I was transferred to the OR table.

I had a few questions for you all. I was wondering how often consent forms have the wrong side listed on them? I was also wondering why I was required to sign an incorrect consent form before I was allowed to speak with the doctor? I was really concerned that they'd accidentally use the bad consent form in the surgery And is it usual to be knocked out before even being put on the OR table?