E2M8 is impossible to complete with 100% in all categories, due to there being a push-wall maze on the maps that was intended to be part of a contest, which required a sign to be found saying "Call Apogee Say 'Aardwolf'". However, the contest was aborted when the game came out, but the sign was left in. In hindsight, the developers said that they should've removed the sign before release, because they were flooded with calls and mails by players asking what it was about. In later versions, it was replaced with a standard prop from the game.
Because of the game's controversial content, this game was banned in Germany in 1994, as the depiction of Nazi symbolism was considered as propaganda at the time. German game magazines therefore avoided to mention the real title, creating monikers such as "Böser Wolf 3D", "Hundefelsen 4E" or "Wolkenheim 4D". After regulations in the German law were relaxed in 2018 to allow games with symbolism, the ban was lifted in October 2019.
There are 3 members in the Grosse family. There are Hans, Gretel, and Trans, which all except Trans appeared in the game
id Software revealed the genealogy of Wolfenstein 3D's protagonist, B.J. Blazkowicz. In that, id confirmed that B.J. and their other characters, Billy Blaze (of Commander Keen) and the "Doomguy" (of Doom (1993)), are all related. B.J. was born William Joseph Blazkowicz and became the grandfather of Billy Blaze, whose real name is actually William Joseph Blazkowicz II (his legal surname derives from his father's, a talk show host and news anchor, stage name). Finally, Billy Blaze would go on to become the father of the Doomguy, born William Joseph Blazkowicz III. However, it is unclear whether id Software's B.J. and MachineGames' B.J., as well as the original Doomguy and the Doom Slayer of Doom (2016), are the same and identical characters and thus genealogically related due to their respective iterations' contrasting backgrounds.
At the time of the game's release, Nintendo of America had a reputation of distributing non-violent and family friendly games. For the Super Nintendo port, the developers from id Software were given many strict guidelines to follow in order to meet Nintendo of America's standards, which included the removal of blood, gore and any reference to Nazis. As a revenge, id Software later handed the game's source files to Wisdom Tree, a developer of Christian video games. Wisdom Tree then turned this game into Super Noah's Ark 3D (1994).