The original Spectrum, Amstrad, C64, Atari ST, Amiga releases were supplied with an A2 poster of the cover-art overlayed with some screen-shots at the bottom.
On May 31, 1988, Platoon was put on the infamous German index by the BPjS. For more information about what this means and to see a list of games sharing the same fate, take a look here: BPjS/BPjM indexed games.
Some UK copies came with a bonus audio cassette featuring the Smokey Robinson song 'Tracks of My Tears', as heard in the movie.
One of the few titles released by Data East for the PC that was a DOS executable, and had hard disk installation available.