Overall, the Levius anime remains quite loyal to the manga. However, there are certain character expressions and fight scenes that might be presented differently for the sake of animation. But the core story and themes are intact.
I'm not sure there's a direct connection. Maybe Tara Reid has been involved in some promotion or adaptation related to Archie Comics, but that's just a guess.
Sometimes, in cartoons, a scientific experiment gone right gives the kid the power to become a motorcycle. It could also be that a friendly alien grants them this unique ability as a gift.
The typical features of cartoon Easter eggs involve being visually appealing with vivid hues and charming illustrations. They may incorporate elements from well-known cartoons, have special textures, or be decorated with elements that make them stand out and be appealing to kids and adults alike.
Some comic book specialty stores might have it. You could also check websites dedicated to manga like Right Stuf Anime. Sometimes, local comic conventions or flea markets can have rare finds too.