Charlie tells Evelyn that he and Chelsea have been dating about a year and a half.
However, at the dance studio, Charlie tells Chelsea that they've been together for almost 2 years.
When Chelsea and Charlie are at the dance studio, the woman in charge tells all the couples to switch partners to the person on their left. Charlie switches places with the older woman to his left but Chelsea switches with a man to her right.
The commercial that Alan and Jake are watching is for Luminol, to treat depression.
Jake then asks Charlie if he is depressed because he has to go ballroom dancing, and he suggests to Charlie that he should take Lumitrol, not Luminol.