Hold a three question interview with the claimed author. Ensure that only two questions are based on the paper's claims, eg, So, Professor Newton, is rate of fall linearly or exponentially related to mass?
Which is true, (A and A->B) or (A and A->C)?
A cheater will fret over whether B or C is true, while someone who did the work will probably immediately identify that A is false and that the question is misleadingly worded.
F = GmM/r^2
Where m and M are the masses of the object and earth respectively, G is Newton’s universal gravitational constant, and r is the distance between the centre of masses of the object and earth. So why is there no mass in your little g? Because the force is directly proportional to the mass of the object (holding earth’s mass constant and the distance from it constant).