I listened to Lara on Eyre's podcast on Spotify today, who was a previous contestant and she made some good points about the participants. ( this is just last week's episodes ).
Firstly she said that the whole forgetting the rings and being made to wait at the altar was a total set up. If someone was genuinely late, they would have taken them off to a side room and explained that the car had broken down, not left them standing there for ages!
Also, and I think someone else mentioned this, Bec has had a lot of reconstructive work on her jaw, which probably helps explain both her insecurity and her slightly strange mouth movements.
Anyway, it's a v funny podcast and well worth a listen!