When Jay walks into the living room (before Manny comes home from his Valentine's Day date), Joe is sitting on the couch with his hand tucked in the front of his pants while watching TV. This is a nod to Ed O'Neil's character Al Bundy from his earlier hit show Married With Children (1987). The "hand down the pants" was his signature move on the show.
Alex asks Ben how old he is thinking he's "like, 40" and in reality the actor is 33