We have analyzed many variables in Cantonese but not in other languages: classifier specialization, tone mergers, vowel splits and mergers, motion event expression, and (L > R), as well as (VOT) and (PRODROP). As little sociolinguistic work on any variety of this globally large language exists, these studies serve as useful models to expand variationist studies to languages that vary in many ways from the North American, Indo-European languages of focus to date. We show that classifiers are developing a specific semantic contrast (for number-marking) in Heritage Cantonese, amplifying a homeland trend; that three tone mergers that were reported to be completed are only partial, in both homeland and heritage varieties; that some vowel mergers and splits may be attributed to influence from English, but that changes in the constraints governing motion event expression cannot be attributed to simplification or English-contact effects. We report on covariation among the variables, showing that it is not the case that the same speakers lead change in each. Thus, it is not easy to claim that language proficiency or patterns of use are responsible for the variation. Rather, internal change and identity-marking motivations for change must be considered.