Abstract: We study in this work the ambiguity between two definition of vacuum energy, namely, the energy of the Zero-Point fields and the minimum of the Effective Potential, first devised by E. Myers1. We name their difference Zero-Point Anomaly (ZPA) and show that for a real scalar field in the geometry of Casimir plates the ZPA there exists but it is undetectable via Casimir forces. We point out possible generalizations of ZPA and physical implications Ver menos