* Roleplay/CelestialRefresh: TheMultiverse is it. While each world in the Multiverse is separated from each other with cosmic void, each world's inhabitants may know about other worlds, what [[ForegoneConclusion can and WILL lead to Anachronism Stew]].
** Currently it was smoothed out a bit, after introducing the Rings system, where each planet with similar technological progress are placed in one Ring to separate it from Lower-tech worlds and Higher-tech worlds. Terran type planets (different iterations of The Earth) are not separated, however.
* Roleplay/DestroyTheGodmodder: Due to the style of play (Read as: a great lack of style of play) this forum game is a great example of this trope, from dinosaurs and lasers, to spacemen fighting knights.
** As a result of MedievalStasis and SchizoTech, the LEGO Planet and Dino Attack Team is a NinjaPirateZombieRobot AnachronismStew.
** During the 1957 flashback, characters notably spoke with modern slang words and phrases such as "bro", "my man", and "dude". However, [[InvokedTrope this was intentional]]. [=PeabodySam=] wanted the characters to seem much younger than their 2010 counterparts, and so chose these words and phrases since readers would associate them with youth; however, [=PeabodySam=] did not want to use slang from TheFifties such as "swell" or "golly", fearing that they would distract readers with their "corniness" and thus detract from the point of the flashback.
*** In the same flashback, "Duplo School" was mentioned, but Duplo did not exist until 1973.
* ''Roleplay/RollToDodgeSavral'' is set an ancient-medieval fantasy world, yet it has several elements which come from notably different time frames. The witches in particular tend not to blend in with the ancient-medieval aesthetic, especially with regards to their clothing.
** The Witch Grimhilde dresses like a cowgirl and wields colt-45 revolvers. Her minions wield muskets even though most of the world uses spells, bows, or crossbows for ranged weapons.
** The Witch Beatrice wears an SS-officer’s uniform.
** The Witch Schierke wears a lab coat and safety glasses. She also has an industrial facility in her lair complete with forges, lathes, mills, and power generators.
** The players are not immune to this either. One player becomes a bike-riding cavalier while another one uses a rocket propelled grenade launcher.