I'm not sure. It could be a cereal designed for a specific fictional character who wears a headband. But without more context, it's hard to say exactly.
There may be no real connection at all. Freaky Flakes Cereal Box could be just a random item someone thought to juxtapose with Pulp Fiction. It could be for the sake of creating an interesting or thought - provoking title. Maybe someone is exploring the idea of how a cereal box could be used as a prop or symbol in a story inspired by the style of Pulp Fiction.
The aesthetics of Pulp Fiction are known for their grittiness, bright colors in some scenes, and a certain retro - modern feel. A Freaky Flakes Cereal Box could be related in terms of color palette. If the cereal box has bright, bold colors, it could be seen as fitting into the visual style of Pulp Fiction in a way that draws the eye and adds to the overall chaotic - yet - appealing look.
A 'cereal graphic novel' could be a graphic novel that has some sort of connection to cereal. Maybe it features cereal characters, like the ones often found on cereal boxes, in its story. For example, it could be about the adventures of a mascot from a popular cereal brand.
Cereal soup definitely isn't a comic. Comics are visual stories with panels and characters, while cereal soup is something you eat. They are completely different things.
I'm not sure if there are many widely known 'cereal graphic novels' out there. However, some small - scale or indie works might exist. Maybe a local artist has created one based on a local cereal brand in their area.
Cereal is presented in a rather ordinary way in 'Pulp Fiction'. It's likely just shown as a regular food item that the characters might consume during their daily routines.
The cereal in 'Pulp Fiction' could potentially be a symbol of the ordinary in the midst of the extraordinary. The movie is filled with all sorts of wild and crazy events, but seeing a bowl of cereal is a reminder that these characters also have normal, routine aspects to their lives. It also might be used to add a bit of realism to the scenes, as people do eat cereal in real life.