A variety of ancient sources suggest that there was more than one Aristophanic play entitled Πλοῦτος, and the scholia on the extant Plutus show that one ancient commentator erroneously thought that he was working on a comedy of 408 BC when in reality he had the comedy of 388 BC in front of him. This error, which most likely arose because there were two similar versions of the late Plutus, has often been attributed to the first-century BC scholar Didymus Chalcenterus. It is here argued that the basis for this ascription is weak and that there are in fact substantial counter-arguments. Instead of Didymus, a later commentator such as the second-century AD scholar Symmachus may have been responsible for the mistake, which probably had more to do with the evolving transmission history of Aristophanes’ comedies than with careless scholarship.