The Optimus Prime Kreon in this set is based on the character's rusty, crusty "evasion mode" from the Age of Extinction movie. He has a ferrous-metal backpack, which is used to interact with the magnetic parts in the various sets. In this specific set's case, it's so he can be grabbed by the buildable Strafe's dino-claws, once Strafe uses said claws to open up the "laser" cage made to contain Optimus. (Yeah, we know Strafe appears way after Optimus ditched this look in the movie.)
If Optimus led his troops back to the Decepticons’ poison lab, the convoy happened upon the Decepticons hauling barrels of poison out of the poison lab. Windcharger and Ironhide suggested two different plans to Optimus: Windcharger wanted to use his magnetic powers to cause a confusion, while Ironhide wanted to simply go in for a full frontal assault.
All of the Tiny Titans were sold blindpacked. However: there's a tiny clear window in the back to peek at the item inside, making the task of getting the ones you want easier. Every collectible card included in Tiny Titans has a scannable insignia sticker on it. Scanning the badge unlocks a random amount of Energon "currency" and a randomized bonus power-up item, and can only be scanned once per day. It's honestly quicker and less redundant to say which toys don't have this feature.
The U.S. release of Super Fire Convoy had the Japanese voice replaced with an English voice (with the lines, "Optimus Prime, Maximize!" and "Autobots, Transform"), and Autobot insignias were added on the side panels. Much like the Japanese version, Optimus Prime's normal robot mode can combine with Ultra Magnus (sold separately) to form Omega Prime.
The third version  would quite possibly have been the most gimmick loaded Transformer in the history of the line, simultaneously being a Powermaster, Headmaster, and triple changer. The Headmaster also would have been a triplechanger, turning into a sort of armored four-wheeled rover (Roller II?) and robot as well as a rather silly looking Optimus Prime head with four vertically aligned wheels jutting off the sides. It seems that when the extra Headmaster gimmick was scrapped, the super mode head remained separate rather than being reintegrated into the trailer hitch such as on the earliest design. Notably, the body of this design is extremely close to the final design.
Although the animated series ended in the U.S. after The Rebirth, Optimus Prime continued to appear in animated sequences of Transformers toy commercials, progressing from Powermaster to Action Master. He even made an appearance as a computer-generated Combat Hero. Many episodes of the series were re-aired to promote Transformers: Generation 2. During these sequences, computer-generated scenes featuring key G1 characters are borrowed from Generation 2 commercials to serve as opening, closing, and commercial bumpers. Optimus Prime is shown in the opening and closing fighting Generation 2's Ramjet.
Today, generally the creator sets only emphasize Lego as a building system. They come with pieces and instructions for two alternate models. Generally, Creator sets utilize a more basic color selection and look less “realistic” due to the emphasis on a versatile piece selection. Contrast that with current licensed themes and even Lego’s own proprietary themes. Themed/licensed sets are now trying to achieve more “realistic” models. As a result, piece and color selection skews toward more specialized pieces and colors again making the “critical mass” of pieces harder to achieve.
As the number of sets released has increased, the harder it has been for stores to parcel out their shelving space. In order to make more sales, decisions have to be made as to which sets will be carried. Not every store can carry the whole product line (not even all official LEGO stores carry the whole product line). This process will favor the sets that drive sales the most, such as the licensed sets. The traditional boxes of bricks are pushed out of the way for the more profitable lines.
They’ve been invaded by pop culture favorites, too. Robot Chicken turned the couch gag into stop-motion animation, they’ve parodied Breaking Bad and the Game of Thrones opening sequence, and the living room has gone all topsy-turvy M.C. Escher-style. But best of all, for our purposes, was when the five Simpsons drove into the living room as familiar vehicles, then transformed into robo-Simpsons. Baby Maggie was a blue Volkswagen Beetle, clearly as an homage to Bumblebee, despite the odd color choice. Perhaps it was it was switched to match her onesie.
The TakaraTomy "Autobot Alliance" release of this toy has some significant differences, including casting the red plastic in a darker shade, making his shin and wheel joints grey rather than Hasbro's bronze, painting the Matrix of Leadership silver, and swapping out the dual energon swords for battle hooks, similar to 2010's Leader class Optimus Prime. However, due to the Japanese release retaining the Hasbro packaging, the box still advertises the dual energon swords rather than the hooks. He retains the masked face used for the Hasbro release.