Which parts of this passage demonstrate the use of the bandwagon technique to persuade readers?

You did not provide the passage, however, the logic behind bandwagon persuasion is that something is good just because everyone says so, which may not necessarily be true. It's like saying everyone loves reading twilight and it has sold millions of copies. That does not necessarily mean that you have to think it's good, or that it is overall a good book, it just means that people like it.