Ultra Magnus has the honour of being quoted in scientific literature. (2011)
Hisashi Yuki was VERY proud of how he designed Car Robots God Fire Convoy to have Fire Convoy and God Magnus "shake hands" as part of the combination, so much so that he personally requested the animators of the CR show include it as part of the combination sequence. (2000)
MP-05 Megatron was designed in only twelve days by Takara designer Hisashi Yuki. (2006)
Where Slipstream got her colours from was debated within the fandom, with the most frequent guess being G2 Ramjet. However, when contacted about it, Derrick J. Wyatt revealed that her colour scheme was actually "loosely inspired" by the Godmaster Overlord. (2008)
To make sure her performance as Slipstream was sufficiently Starscream-y during recording, Tara Strong would have Tom Kenny read her lines first, allowing his delivery and intonation to inform her own. (2008)
in the Japanese dub of Animated, in addition to their personalities, Slipstream also tells us what the names of Starscream's clones are. (which is notable, as the names of the clones are never actually said in the original english version of the show)
Several Cybertron toys were redecoed and re-released as part of the 2007 Movie toyline, reportedly due to the toyline selling so well more product was needed to meet demand. (2008)
Optimus Prime tears off a fake head the Decepticons placed on top of his body to control him. (1985)
Bulkhead turns his kibble into a chair. (2008)
Wreck-Gar throws his own G1 vehicle mode at Bumblebee. (2008)
the two mutant creatures from the Animated episode "Survival Of The Fittest" are drawn in homage to G1 Pretenders Bomb-Burst and Submaruader. (2008)
the commercial for the Armada Unicron toy uses footage from the 1986 movie instead of Armada. (2003)
the 2007 comic adaptation of the 1986 movie adds in an additional scene of Omega Supreme, Superion and Defensor duking it out against Bruticus and Menasor at the Ark, justifying why they weren't there during the movie. (2007)
the interactions between Purple Wicked Convoy and Shockwave in the Generations Selects manga reference Akane and Alexis Kerib from SSSS.Gridman. (PWC is repurposed from SG Optimus, who Akane was designed after, while Alexis Kerib and Shockwave share a voice actor) (2020)
"Instruments Of Destruction" had its lyrics 'censored' for use in the 1986 movie.
Bumblebee attended Haillee Steinfeld's live performance of her single "Back To Life" (2018)
The full combination sequences for the Energon/Superlink combiners are seen only once in the whole show...in the non-canon 'tournament' episode. (2004)
The very erratically-edited opening fight of the Beast Wars episode "Dark Designs". No other scene in the show ever attempts the same "shaky cam" effect. (1996)
Hardhead sings karaoke. (1987)
The first episode of Animated uses scenes from the G1 cartoon to represent archive footage of Cybertron during the war. (2007)
For Revenge Of The Fallen, Stan Bush re-covered The Touch as "Sam's Theme", completely unsanctioned or unrequested by Hasbro or DreamWorks. (2009)
The RID 2001 Optimus Prime toy has a voice chip that says "Optimus Prime, Maximize!", likely a sign of how late in the design process the decision to move away from the Beast Era was. (2001) (clip from @Peaugh 's video)
the Autobots disguise themselves as a giant buddha statue that fires missiles at the Predacons. (2001)
Rattrap discusses a Cybertronian bar. (1998)
in the film "Boogie Nights", Mark Wahlberg's character sings The Touch, inadvertently foreshadowing his role in Transformers many years later. (1997)