[1] When the Cuban government banned professional baseball after the end of the season, Almendares's general manager Monchy de Arcos, who was also a scout for the Cleveland Indians, helped Hernández secure a contract with the latter organization.

[1] Hernández remained with the Angels until April 10, 1967, when he was chosen as the player to be named later in a December 2, 1966, deal that sent Dean Chance to the Minnesota Twins in exchange for Pete Cimino, Jimmie Hall, and Don Mincher.

Hernández served as the Royals' everyday shortstop in their inaugural season, and received the plurality of the starts at that position in 1970, sharing time with Rich Severson and Tommy Matchick.

He was traded along with Bob Johnson and Jim Campanis from the Royals to the Pirates for Freddie Patek, Bruce Dal Canton and Jerry May at the Winter Meetings on December 2, 1970.

[4] On September 1, 1971, Hernández was part of a notable milestone when, for the first time in baseball history, a team fielded a lineup that consisted entirely of African-American and Latino players.