Canonizing

Canonizing is the act of inserting a previously apocryphal or pseudocanonical bit of fancruft or omitted authorial intent into canon. It's kind of like fanservice for continuity freaks.

Continuity concepts

The Powerdashers having the names "Cromar", "Zetar", and "Aragon".
Nightbird being a full-fledged Decepticon.
The origins and mechanics of the Brainmasters.
Scorpia being a female Transformer.
The Liege Maximo being one of the Thirteen.
Star Saber being a knight templar.
Pretender technology being involved in the development of beast modes.
Three unused toy concepts: a jellyfish, a manticore, and a triffid from the Beast Wars Telemocha Series.
The deleted scene from "Nemesis Part 2" of Generation 1 Megatron's spark being placed back into his body.
The Starscream in this Machine Wars art possessing the deceased body of Skyquake.
Universe Ratchet originating from a 2001 Robots in Disguise universe.
Universe Longhorn being a new form of Ramulus.
Bio information for Universe Stockade and Magna Stampede.
Bio information for Universe Inferno and BotCon 2006 Inferno.
Ultra Trion being a form of Ultra Magnus and successor to Alpha Trion.
Universe Defensor being an upgraded Hot Spot and being equipped with the Chaos Armor.
Energon Omega Sentinel sometimes being a group's body-type instead of an individual.
Bio information for Binaltech Blackarachnia and Decepticharge.
Optimus Primal the Protector hailing from the universe of the English version of the Beast Wars cartoon as opposed to the Japanese version.
United EX Straxus being a dimension-hopper from the Marvel Comics continuity.
Howlback being transgender.