I've never heard the bit about windows and I don't see how that wouldn't be very obvious in a pre-canbus car; "why does the ECU have a sense line to the driver's side window?"

What is easy is looking for the car to be started and then held at a raised idle. Once cars had traction/stability control, the ECU could look for mismatched front/rear wheel speed, or the steering wheel not being turned more than a few degrees.