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Press 1P Button 1 for USA and 1P Button 2 for Japan. Note that the "Winners Don't Use Drugs" and export warning screens are not affected by this switch; they're dependent on the region flag at 0x5FFFE in the game ROM.
There are two different graphics viewers in the game. To access the first one, simply hold 1P Button 1 + 1P Button 2 and insert a coin. The first graphics viewer orders the graphics into named patterns of tiles.
In both viewers, press 1P Up / Down to scroll through the graphics and 1P Button 1 / 2 to change the palette.
Hold 2P Start at the end of each half-inning (After the camera zooms out but before the music stops) to access this field viewer. Use 1P Joystick to move the camera and 1P Button 1 / 2 to zoom the camera in and out. Press 1P Start to resume gameplay.
Pattern Names: BALL, FOLL, GAME, HOME, OUT, PLAY, SAFE, STRI, TIME, WALK
The oldest set of call text is much smaller than the calls seen in the final game and only come in two colors, white and blue.
Pattern Names: TN1 to TN9
Apparently, it's because he hit one of the other players. There are graphics for a downed player, two players with a stretcher, and carrying the injured player off that are never used. It doesn't seem possible for a player to get injured in the final game.
Pattern Names: TT1 to TT7, ATT1
It's a baseball-throwing robot! Maybe injuring the pitcher could have triggered this fellow's appearance on the field? There's no palette that matches the robot in the final game; this is just a guess on how it would look.
Pattern Names: TM, SO
Early "TIME" and "STRIKE OUT" graphics that matches the design of the "GAME SET", "PLAY BALL", and "HOME RUN" text.
Pattern Names: HKAO1 to HKAO5
There are five different designs for the Home Run hitter in the graphics ROM, but only the first one is used.
Pattern Name: ENTL
Graphics for a "Entitle two-base" (エンタイトルツーベース) call, the Japanese equivalent of a ground rule double. There's no situation that would trigger a ground rule double in the final game.
Pattern Names: JOYS1 to JOYS5
Buttons and a joystick that would probably be used for a tutorial screen in attract mode. Like the pitching robot, the palette for this is just a guess and doesn't actually exist in the game ROM.
Pattern Name: SENSHI
A completely out-of-place soldier sprite. Is that Roy Adams?
The commentators in the high score screen have slightly different designs between versions.
The same change can be seen in the Push Start screen, although the female announcer just has a different palette that changes her hair color and skin tone.
There are 12 teams to select in the Japanese version and 26 in the US version, matching the number of teams (In 1990, anyway) in the NPB and MLB leagues, respectively.