One of Chun-Li's win quotes makes reference to her supposedly 'throwing her bracelets'. Longtime fans know that this was a joke in reference to rumours that in the previous Street Fighter 2, Chun-Li could throw her bracelets as a projectile.
Subsequently, those rumours gave rise to Chun-Li's current Kikkoken fireball projectile added later in the series in Street Fighter 2 Turbo.
The character named Hugo also appeared in the Final Fight series. Likewise, Poison (the character that appears in his intro and victory poses) was also an enemy in that game, but only in part one.