[1] The Phillies pitcher on that day was Grover Cleveland Alexander, and the game marked the first of 250 times the pair teamed up as a battery in the major leagues.

[2] After the 1917 season, in one of the most lopsided trades in major league history, the financially strapped Phillies sent Killefer and Alexander to the Chicago Cubs for two players and $55,000 in cash.

[9] Killefer had another strong season in 1919, hitting a career-high .286 batting average and leading National League catchers in fielding percentage, putouts and assists.

In the Deadball Era, catchers played a huge defensive role, given the large number of bunts and stolen base attempts, as well as the difficulty of handling the spitball pitchers who dominated pitching staffs.

[13] Richard Kendall of the Society for American Baseball Research devised a study that ranked Killefer as the most dominating fielding catcher in major league history.

[15] Killefer enjoyed little success as the Browns' manager, never finishing above fifth place as the depression-era team had cut its payroll significantly.

[1] Killefer accepted a role as manager for the Sacramento Solons in the Pacific Coast League, leading them to a first-place finish in 1937.

[16] As a scout for the Indians, Killefer was involved in the signing of Larry Doby in 1947 (the American League's first black player).

[1] Killefer was credited with helping the development of such catching standouts as Bob O'Farrell, Gabby Hartnett, Rick Ferrell, and Walker Cooper.