The hamburger in Pulp Fiction might also be a symbol of the common or the mundane in contrast to the extraordinary and violent events in the movie. It's something that's so regular, but it exists within this world of crime and chaos. Just like the characters, who have their own strange and violent lives but still partake in normal activities like eating a hamburger.
As far as I know, 'Pulp Fiction' doesn't make any mention of 'Hamburger Royale'. The movie is filled with its own unique dialogue, locations, and items, like the Royale with cheese, but that's not the same as 'Hamburger Royale'. It seems they are two separate things with no connection within the context of the movie.
The 'the hamburger boy story' could be centered around a boy and his adventures that are related to hamburgers. It could be that he goes on a journey to find the best hamburger in the world. Or he could be in a situation where hamburgers play a crucial role, like in a food competition where he has to make the most amazing hamburger.
Stats for stories regarding National Hamburger Day can vary widely. From a business perspective, the average revenue per hamburger - selling establishment might increase by $500 on this day. In terms of consumer preferences, data could show that 70% of customers prefer their hamburgers with a side of fries. Additionally, there could be stats on the number of different toppings used, with lettuce being the most common topping at around 80% of all hamburgers made.
Well, 'you are the hamburger novel' sounds very odd. Maybe it's some kind of metaphor or inside joke that's not widely known. Without more context, it's hard to say exactly what it implies.