For another comic poet of this name -- or more probably two others -- see alpha 2735.
[1] Or if Wilhelm's emendation (noted by Adler) of tou= to ui(o/s) is accepted, 'younger son of Panaitios'. Either way, this can hardly be the most celebrated bearer of that name, P. the Stoic philosopher from Rhodes, c.185-109 (pi 183). Instead, vol.2 of the Lexicon of Greek Proper Names registers these individuals, father and son, as Athenians and places them in the third century BCE.
[2] Adler's addenda summarily registers the suggested emendations of scholars dissatisfied with the transmitted version of this sentence. They include Tranou ('son of Tranos') for tranos 'distinct', and a dating allusion to Theognis (cf. theta 137) rather than Thespis.
[3] The phrase is attested only here and, according to Adler, in the Ambrosian Lexicon.