Yogi Berra played in the most World Series games with 75.
Frank Crosetti appeared in 29 World Series games as a player and another 86 World Series games as a coach.
Outfielder Tsuyoshi Shinjo, born in Osaka, with the San Francisco Giants in the 2002 World Series. He appeared in three games and had 1 hit in 6 at bats. Obviously, he is also the first Japanese born player to get a base hit in the World Series.
Frank Crosetti played in seven World Series for the Yankees and appeared in a total of 29 games.
Through the 2010 World Series, that is Mariano Rivera of the Yankees who has appeared in 24 World Series games.
4 games is the minimum in a World Series.
Roberto Clemente did it in the two seven-game World Series in which he appeared in 1960 and 1971.