Our Gang's lineup changed frequently; as kids left the series or outgrew their roles, new kids were recruited to join the cast. Some of the cast additions were direct changings-of-the-guard, and those are annotated accordingly. The groupings are not meant to represent a cast lineup for a particular Our Gang short from the period it represents, but rather a more general listing of the main members of the cast during the period.
Pete the Pup (the original Pete—a.k.a. Pal the Wonderdog—was poisoned in 1930; trainer Harry Lucenay used Pete's offspring [who all appear in Pups is Pups] in the series after they reached maturity starting in 1931)