At Toronto, the Blue Jays beat the Minnesota Twins, 7 – 3, with two amateur umpires and two coaches officiating: Toronto coach Don Leppert and Twins coach Jerry Zimmerman umpire. Since 1910, this is just the 5th time this century, and the first time since 1941, that active players or coaches have umpired.

This Day In Baseball

On August 25, 1978 — At Toronto, the Blue Jays beat the Minnesota Twins, 7 – 3, with two amateur umpires and two coaches officiating: Toronto coach Don Leppert and Twins coach Jerry Zimmerman umpire. Since 1910, this is just the 5th time this century, and the first time since 1941, that active players or coaches have umpired.

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Sources:
Baseball Reference August 25
National Pastime August 25
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game