If I get presented with this document in the future, that's what I'll do. As it was I was incredulous and just assumed that it was a mistake that would benefit

If I get presented with this document in the future, that's what I'll do. As it was I was incredulous and just assumed that it was a mistake that would benefit from having attention drawn to it. I think you may underestimate the thoroughness of the bank's representative at this proceeding. If they detected the modification, they would simply print out a new one and tell me I had to sign it, or reschedule the closing, which would have been unacceptable at the time, and because of the verbiage in the contract might have result in my offer being voidable by the seller.