Plot hole: Joe says that he and Allison told people they conceived Ariel on the weekend of their wedding, even though they knew that Allison was about five weeks pregnant at that time. In episode 6.15 the plot is all about how Allison is expecting Ariel and there is a lot of talk of how she is their first child and they can't tell anyone about it because they aren't married yet. But in the season two episode "Sweet Child O' Mine" it was revealed that they were going to have a baby once before Ariel, a boy they were going to name Brian, but that Allison miscarried.
Allison Dubois: It's 9:00. How am I supposed to know you're OK? How do I know you're not lying dead somewhere?
Joe Dubois: If something had happened, somebody would've called. If I were dead, who are we kidding, you'd be the first to know.