DOSBoxThe Steam download version of the game is listed as Windows 2000/XP/Vista platform because the executables are modified to use a DOSBox variant (v 0.70); additionally the traditional setup.exe is missing.
It is confirmed that neither Valve or id Software contacted the DOSBox project staff and initially the game didn't includes the TXT´s that must be present under the GPL license (so they failed to fulfill 2 points of the GPL license).
Two days after the launch, there was an update that includes COPYING, AUTHORS and THANKS.txt of the DOSBox 0.7
EvilutionMany people were angry about Id's decision to include Evilution in Final DOOM - it was originally going to be released as a freeware expansion onto DOOM II.
German indexOn April 30, 1997, Final Doom was put on the infamous German index by the BPjS. More information about this topic can be found in the game group.
Information also contributed by DarkDante and Xoleras