Marcy says her parents never let her have Barbie dolls. But season two "Guys And Dolls" revolves around her old Barbie doll.
Jefferson D'Arcy spends the night trying to sell a rare Barbie doll he gave to Marcy. During a conversation he claims Marcy never owned a Barbie Doll. In "Guys and Dolls" of season 2 we see Al and Steve Rhodes searching all of Chicago for a Barbie Doll Steve sold that was Marcy's when she was a child.
The second hand on Marcy's alarm clock doesn't move - meaning the clock is not wound, yet the time changes a couple times.
Jefferson calls Al 'Ed' in one scene