Everyone shows up to the party, even people who were not invited. Most of the people don't even know who Gatsby is and how he looks like.
After the parties, people leave recklessly. There is a scene of a guy, called Owl Eyes, who crashes his car just a few seconds after he starts driving away. Furthermore, because he's drunk, he continues to drive it even after one of the wheels has come off.
In the very, very simplest terms, judging the validity of an argument starts centers around this process:
1) Identify the rhetoric (Lines of Argument) from the actual, formal reasons. Separate the persuasive language from the actual claims to truth and fact.
2) Analyze those reasons (claims to truth and fact) by identifying their logic (often in the Implicit Reasons) and evidence.
3) Test and evaluate the logic and evidence; identify logical errors and ask whether the evidence can and has been tested and objectively, repeatedly, factually verified.