There's a 1988 minor league card with a guy taking a baseball up the groin. Staged, but still funny.
1972 Topps Billy Martin flipping off the camera
1972 Topps - [Base] #33 - Billy Martin
Courtesy of COMC.com
Depictions of African American ballplayers in the 1963 Gad set are pretty stereotypical racist imagery:
1961-63 Gad Fun Baseball Fun Sports Shorts - [Base] #46 - Moses Fleetwood Walker, Welday Walker [Good to VG‑EX]
Courtesy of COMC.com