Instead of just having a line that goes from a single point to another, spline points themselves could have a number in them, indicating which spline point it is on the spline. The last point on the spline could have a different graphic, indicating that it is the last point.
The handles for spline direction could also be rendered with a different shape than the point itself, to make it vastly clearer which one is a point and which one is a handle, which can sometimes be tricky if the spline handles are pulled really close to the point.