Perfect Player:
(Doesn't work in Career Mode)
First you must create a player and name it Max Stats and set his number as 99. Now you can raise his stats as high as you'd like.

Unlocking Gold era players:
Spend your reward points on the following players

Al Barlick: 10 points
Al Lopez: 15 points
Babe Ruth: 50 points
Bob Feller: 25 points
Bob Lemon: 25 points
Bobby Doerr: 25 points
Buck Leonard: 20 points
Christy Mathewson: 45 points
Cy Young: 50 points
Dizzy Dean: 40 points
Early Wynn: 25 points
Eddie Collins: 40 points
Enos Slaughter: 20 points
George Kell: 30 points
Glover Alexander: 40 points
Hal Newhouser: 30 points
Honus Wagner_45 points
Jackie Robinson: 50 points
Jimmie Fox: 45 points
Larry Doby: 25 points
Lefty Gomez: 40 points
Lefty Grove: 40 points
Lou Boudreau: 30 points
Lou Gehrig: 45 points
Mel Ott: 45 points
Mickey Cochrane: 40 points
Monte Irvin: 20 points
Mordecia Three Finger Brown: 35 points
Pee Wee Peese: 20 points
Phil Rizzuto: 20 points
Ralph Kiner: 30 points
Red Schoendienst: 20 points
Rick Ferrell: 25 points
Rogers Hornsby: 45 points
Roy Campanell: 35 points
Satchel Paige: 40 points
Sparky Anderson : 20 points
Tris Speaker: 40 points
Ty Cobb: 50 points
Walter Johnson: 45 points