When the roses are being handed out characters who haven't received a rose are seen holding some, including Damien and Dog poo.
When Jimmy comes to offer a gift basket to the boys in an attempt to win them over, his own picture gets turned around. This can be seen at almost 19 minutes through the episode.
When Cartman says that they need to narrow the choices down from 20 to 10 candidate, there are 21 candidates sitting in the group.