2. I assume the car was looked at and maybe test driven. I find it hard to believe this was a 'ruse' left for the final moments. I can imagine people getting confused or not hearing or understanding I suppose.. someone wants a discount, salesperson says we have a demo over here we can do a large discount on.. and somehow the miles or reason for discount were not discussed. I wouldn't call this a ruse, and once again not something I've done or seen since it's just a waste of time. Obviously the person will discover the miles at some point, so why have the drama.
3. Illegal to pad a term sheet and then stuff a $1000 'charge'. You'd atleast have to have the customer sign the contract for what they were getting for their $1000. Dealers attempt to add things often, but they can't be secretly padded into the initial payment discussions. It's superficially easy for a customer to snap a photo of a preemptive term sheet and burn a dealership at the DMV dealers office or back out a whole deal months or even years after purchase if this was documented. Again, not something I saw in 10 years.
4. I saw countless people get confused by the "total" on the contract, usually when selling a used car to a less mathematically and logical buyer for some reason. You can sell a Porsche to an accountant and all goes great everytime, but sell a used Corvette to someone that personally requested a 72 month loan and watch drama unfold as he wonders why the total of payments on his $50k car is $70k. Luckily I was good and could always explain reality of sales tax, registration, and interest to these people. But not everyone is so lucky.
Maybe the dealerships I worked at were above average in integrity, because they were high performers and high performers don't have time to fraud induced drama, but honestly if you land on a dumb salesperson that can't explain your confusion to you, you can end up thinking your confusion was their attempt at a scam.