Factual error: Slater had close to a dozen sticks of dynamite on him. At the very least they should have knocked Winona Ryder down, and made her deaf for a few days.
Factual error: After Veronica and JD give Heather the poisoned drink, she falls and shatters the glass table. The way that the glass breaks is not realistic. She doesn't fall far enough to cause the entire top to shatter into tiny pieces. Most likely, the top is strong enough that her body would rest on it.
Answer: People who were bullied by Heather, Kurt, and Ram might feel better because of the faked suicides: they believe that the bullies were actually struggling with issues. As one boy says, he now thinks that Heather quit dating him because she was dissatisfied with her own life, not because he wasn't good enough. In the locker rooms, a girl tells Veronica that she thought Heather was just a bitch, but "guess I was wrong."