The whole prom disaster was caused by Rick messing up for gambling on the tunnel after being owned. But unfortunately, Jerry is the guiltiest one of the season 1 finale because 1) he was the one who gave too strong orders about the tunnel 2) he ruined Molly's romance with Ben by giving good news to the Stages TOO STRONG and TOO HURRIED. The prom episode is not where it ends and I think not only Rick messed it up, but Jerry should be ashamed on everything in the prom.
