Other mistake: At the beginning of the movie it states that the documentary crew went to Mount Rose in 1995 for its fiftieth anniversary. Yet when the crew is interviewing Amber, after her costume is stolen, the graffiti on the wall next to her has the dates 1996 and 1997.
Other mistake: Near the end when showing Gladys in the paper, the article surrounding her photo is the same 2 paragraphs repeated over and over again.
Chosen answer: I don't think anyone actually put gasoline over the float - it's suggested in the movie that the float is leaking gasoline because Becky's father imported it cheap from Mexico.
Shay