She uses a number of actual details and facts to impress the readers into believing that the burgers are something great and making them want to know more about what makes people crazy about the burgers, what kind of people the owners are, and what actually happened behind the counter.
She deliberately leaves the readers full of questions and with deeper interests, using words like "speculation" (Perman 9), "rumor," "gossip," and "numerous questions" (Perman 10).
On the other hand, in the introduction of Fast Food Nation, the author Eric Schlosser splits it into two different parts, a story about Cheyenne Mountain Base and a quick overview of fast food industry.
Throughout the prologue of In-N-Out Burger, Perman successfully gets the attention of the readers by describing the facts in detail, which makes them want to turn the pages for further reading.
From a functional point of view, the introduction of In-N-Out Burger works much better than that of Fast Food Nation by guiding the readers with much expectation to the beginning of untold, upcoming long story at the end of the chapter.
As mentioned earlier, Perman starts her story with many hooks, which motivate the readers to continue to read the following chapters.
First of all, the facts shown in In-N-Out Burger stir the readers' strong interests to the topic, whereas Fast Food Nation displays the facts only to convince them.
In In-N-Out Burger, Perman introduces many episodes with details.
Perman depicts the story in detail and leaves strong impression at the end, whereas Schlosser makes a short summary of the book at the end that fulfills the readers' interests.
In In-N-Out Burger, Perman starts the chapter with detailed description of the opening day of a new burger shop in a local town without any background information of the burgers or the company.