[Mick]

Gehringer led the league in games in 1929, with 155.  

Playing 155 games in a 154 game season is a pretty nice trick. 

Detroit's record was 70-84 -- 154 games. 

I'm guessing the discrepancy is this -- Detroit and Washington played an 8-inning tie game in the second game of a doubleheader on Sept. 15. I'm guessing the game may have been called due to darkness. Apparently the stats counted for the players, but the result didn't count for the teams. The game must have been replayed in full -- the two teams played again on Sept. 16, Sept. 17, and a doubleheader on Sept. 18. That must be how Gehringer played in 155 games.

That's exactly right. Tie games that were suspended for any reason and started on a separate day counted as two games played for the player, so for the Tigers, both Gehringer and Dale Alexander received credit for playing 155 games in 1929.
https://www.baseball-reference.com/teams/DET/1929.shtml

Nellie Fox actually achieved that trick in 1954, 1955, 1957 and 1959 (156 games in a 154 game season, quite a trick).
https://www.baseball-reference.com/playe...ne01.shtml

Lou Gehrig did it seven times, in 1926, '27, '31, '32, '36, '37, and '38. In 1937 and 1938, he played 157 games, three over the season limit.

[Mick]

Gehringer led the league in games in 1929, with 155.  

Playing 155 games in a 154 game season is a pretty nice trick. 

Detroit's record was 70-84 -- 154 games. 

I'm guessing the discrepancy is this -- Detroit and Washington played an 8-inning tie game in the second game of a doubleheader on Sept. 15. I'm guessing the game may have been called due to darkness. Apparently the stats counted for the players, but the result didn't count for the teams. The game must have been replayed in full -- the two teams played again on Sept. 16, Sept. 17, and a doubleheader on Sept. 18. That must be how Gehringer played in 155 games.

That's exactly right. Tie games that were suspended for any reason and started on a separate day counted as two games played for the player, so for the Tigers, both Gehringer and Dale Alexander received credit for playing 155 games in 1929.
https://www.baseball-reference.com/teams/DET/1929.shtml

Nellie Fox actually achieved that trick in 1954, 1955, 1957 and 1959 (156 games in a 154 game season, quite a trick).
https://www.baseball-reference.com/playe...ne01.shtml

Lou Gehrig did it seven times, in 1926, '27, '31, '32, '36, '37, and '38. In 1937 and 1938, he played 157 games, three over the season limit.