A result of S. Beckmann says that for any 3-point G-Galois cover of the Riemann sphere, if a prime p does not divide the order of G, then p is unramified in the field of moduli of the G-cover. We will discuss a more recent result of S. Wewers: if p exactly divides the order of G, then p is at worst tamely ramified in the field of moduli.