Actor Allusion: Near the end of "Death of Hope", Megatron refers to Omega Supreme as an "Obsolete hulk". Both Megatron and Omega are voiced by Fred Tatasciore, who has voiced The Incredible Hulk multiple times.
Reportedly Frank Welker auditioned to play Megatron, but much like what happened with the live-action films, his classic G1 Megatron voice was ultimately not what High Moon wanted for the character.
The class system was borrowed from a failed D20 based Transformers Game later published under the name Mechamoprhs.
The toyline
Defictionalization: The Barricade design seen in the Siege and Earthrise lines comes straight from an old fanart made by comic artist Guido Guidi of a G1 version of the character from the 2007 movie, represented as a redeco of Prowl with Smokescreen's headsculpt.