* ExecutiveMeddling: The original design was a VideoGame/{{Breakout}} clone with the twist that the "bricks" fire back; they were originally people, but the executives vetoed it. They were then changed to airplanes, but they didn't make sense with the way they moved. After seeing ''StarWars'', the developer was inspired to change the enemies to aliens, which were [[WhatMeasureIsANonHuman acceptable to shoot and kill.]] It also justifies their lateral movement patterns, which didn't work with the previous designs.
* According to TheOtherWiki, designs of the aliens were based on the octopus-like ones from ''Film/TheWarOfTheWorlds'' as well as in squids and crabs.
* KillerApp: The Atari 2600 version
* MilestoneCelebration: In 2008, around the 30th anniversary of the original game's release, Creator/SquareEnix and Taito released ''Space Invaders Extreme'' for the UsefulNotes/NintendoDS and [[UsefulNotes/PlayStationPortable PSP]], and ''SpaceInvadersGetEven'' for the UsefulNotes/{{Wii}}.
** 1998's ''Space Invaders X'' is also an example. In the opening cutscene, the operator of the "new" Tank steers his vessel past the "Tank Graveyard" and smiles grimly at a 1978-era Tank.
* PortOverdosed: There is a version of ''SpaceInvaders'' for almost every platform ever made, including graphing calculators and wristwatches.
* SerendipityWritesThePlot: The speed increase of the aliens as the game went on was an unintended side effect of the weak processors at the time, but the developers liked it enough to keep it in.