Fred Pfeffer had an additional seventy-six errors at second base in his career due to time spent in the Players League giving him the all time Major League mark of eight-hundred fifty-seven errors by a second baseman.
Tough game / tough series / tough season: On June 14, 1876, Andy Leonard of Boston set the Major League record (see above) for most errors in a game by a second baseman. He then went on to set the record for most errors in two consecutive games (eleven) and three consecutive games (thirteen) as well.
Darwin Barney broke Cubs legend Ryne Sandberg's National League record 123-game streak without an error at second base and was three outs from breaking Placido Polanco's Major League record of 141 games, but did not and replied (source) after the game, "It has been fun. It had to end at some point. It's just how the game works and it's a funny game. This is why baseball is unbelievable."