Super Cross, the original planned sequel to Armada. it would have involved Unicron abducting and mutating Transformers from across the multiverse, including characters from G1 and Beast Wars, to fight within his body so that he could absorb the sparks of the victors. (2002)
prototypes for the unmade Animated Marauder Megatron and Hot Shot toys. (2010)
when Megatron and Cobra Commander steal the Matrix, the Autobots receive help from ponies firing Nerf Guns. Mr Potato Head attempts to help the villains escape. (2017)
the Combaticons hang around next to their own combined form. (1986)
the G1 cartoon gives three contradictory origins for the Constructicons- being built by Megatron in one, being brainwashed into evil by Megs in another, and being the ones who built Megs in the third. (1984) (1985) (1986)
the penultimate episode of Cybertron/Galaxy Force pays direct homage to Brave Exkaiser. (2005)
Michael Bay's real-life dogs, Mason and Bonecrusher, cameo in the Transformers movies. (2007-2011)
the IDW "ongoing" Transformers comic run is largely considered as mediocre by most fans...with the exception of issues 22 and 23, the "Chaos Theory" 2-parter written by James Roberts, which are regarded as some of the best TF comics of all time. (2011)
Janelle Monáe praises the Transformers’ depiction of conflict between the Autobots and Deceptions in her acclaimed album Dirty Computer. (2018)
despite being used only once in the G1 cartoon, G1 Optimus and Megatron's energy axe and mace accessories are very popular pack-in weapons, especially in Japanese figures. This can be attributed to how that scene was prominently featured in the JPN opening for the cartoon.
"WAR! WAR! Stop It!", the Japanese OP of Beast Wars. (1997)
promotional trailer for the 1986 movie, featuring a whole bunch of footage that isn't in the final film....and Ultra Magnus in his Diaclone colours. (1986)
Cybertron is brought into Earth's orbit in Dark Of The Moon, yet it somehow does not cause any severe effects on our planet's environment. (2011)
Optimus Prime calls Trailbreaker "Trailblazer" and Spike "Splick" (1985)
Starscream, Blitzwing and Astrotrain carve their faces into a rockface.
the final episode of Cybertron adds in two extra shots that weren't in the original Galaxy Force episode, bookending the Unicron Trilogy. (2006)
Bumblebee regained his voice at the end of the 2007 movie, but Revenge Of The Fallen has him mute again. The tie-in comics explained that Starscream had attacked him and caused him to once again lose his voice. (2009)
Starscream fires his null-ray from his finger. (1985)
Armada Optimus has his traditional chest windows in his Cybertronian body, that his Earth mode ironically does not have. (2002)
Megatron builds a giant purple griffin. (1985)
in the Japanese dub of Prime, Shockwave says "Shock" a shockingly whole lot. (2012)
Masterforce head writer Masumi Kaneda stated that God Ginrai (ゴッドジンライ) was named so that omitting every other Japanese syllable yields the word Gojira (ゴジラ), better known in the west as Godzilla. (1988)
Arcee makes an innuendo. (2006)
the G1 Autobot Cars were all unlicensed approximations of real-world vehicles, many of whom contained deliberate misspellings of the brand names present on the original cars. (1984)
artist Don Perlin draws Megatron with a strange grid-like structure in his mouth. He eventually loses them. (1985)