Title: The Beard
A "beard" is someone who pretends to be a date or partner for someone else. (Originally this was a straight woman pretending to date a gay man who feared exposure.) In this episode, Cory pretends to be dating one of the girls interested in Shawn, thus making him a "beard." Cory actually starting to like the girl violates the beard role.
Cory calls Linda his first girlfriend. Did he forget T.K., from the previous episode?
Linda: I never know what to say when creepy guys are coming on to me.
Cory: Me neither.
Linda: Cory, can I ask you a question?
Cory: Creepy guys don't really come on to me.
Shawn: How do you know if you're having an idea?
Eric (to Cory): So you went behind your best friend's back and stole the girl he was lying to.
Cory (after the girls have broken up with them): I miss Linda.
Shawn: I miss Stacy and Linda.
Cory: And Debbie?
Shawn: And Debbie.
Cory: There is no Debbie!
Shawn: Then how come I miss her so much?
Cory: Do I have an unlisted desk or something?