Continuity mistake: At the start of the scene where Adam and Jennifer are watching sexy vampire shows, there is a close-up of the two. In the close-up, Jennifer's mouth is closed. In the next shot, her mouth is suddenly open.
Timmy agrees to marry Russell because Timmy's work visa has expired and he will have to leave the country. However, in the season 5 episode "Double Down" Timmy states that he has been a US citizen for many years.