The film shows shows the first batter in Game 1 of the 1926 World Series striking out on three pitches-- the first two as a left-handed batter and the third as a right-handed batter.
During Game 7 of the 1926 World Series, Alexander strikes out number 15 to win the game. After the strikeout, the frustrated batter who throws his bat to the ground is wearing number 6.
In Game 7 of the World Series, the Yankee batter, apparently Bob Meusel, strikes out for the last out. In the real game, Babe Ruth committed the last out by being caught trying to steal second base. It is the only time a World Series ended by a runner being caught stealing.
In the 1926 World Series setting, Joe DiMaggio is shown crossing the plate for a score. In 1926 Joltin' Joe was just twelve years old. DiMaggio's major league debut was ten years later in 1936.
Alexander did not play for the House of David until after he retired from Major League Baseball, not before the 1926 World Series as depicted in the film. Thereafter, he toured with the House of David for ten years, often playing against the Kansas City Monarchs, playing against Satchel Paige and other Negro League immortals.
Graham McNamee announces Game 1 of the 1926 World Series as the first transcontinental radio broadcast. Actually, the first coast-to-coast broadcast was the 1927 Rose Bowl.
When the film begins in 1907, Grover and Aimee are already dating, and they are shown getting married before he started his major league career in 1911. In reality, Aimee was only 14 years old in 1907, they likely met after he reached the major leagues, and the two got married in 1918, right before he entered military service.
The film ends with the 1926 World Series, and Grover Cleveland Alexander retired from baseball in 1930, yet he is seen with a number on the back of his jersey, a practice that did not begin until 1931. Because he never wore a number on his uniform, there was no number for teams to "retire" for this great player. Therefore the Philadelphia Phillies retired the block letter-style "P" from their 1915 uniforms to honor Alexander.
An establishing shot of New York City, supposedly in the mid-1920s, clearly shows the Empire State Building---which wasn't built until 1930-1931.
Not only does much of the stock footage (as well as regular footage) show players wearing numbers on their uniforms long before this was the case, a number of the crowd shots were actually shot in the late 1940s or early '50s, as indicated by the clothing and hairstyles.
In an aerial view of Forbes Field, 1940s cars can clearly be seen in the parking lot. Yet the time frame is right after World War I, and any cars in the parking lot should have been Model Ts and other 1910s models.
The fans are shown giving a loud, enthusiastic standing ovation to Alexander for his pitching heroics in the 1926 World Series. However, the games that Alexander won in the 1926 World Series were played in Yankee Stadium, meaning that the fans were rooting for the Yankees, not the Cardinals. The fans were stunned when Babe Ruth was caught stealing at second to end the Series - not just because of the way it ended, but because their team had lost to a team it had been heavily favored to beat.