Main character and plot mentioned
Castle says, "Of course, it all makes sense now. Wendell's secret identity, Johan Fleming, is the same secret identity of Zan, the male half of The Wonder Twins. The Wonder Twins? The Super Friends? Seriously, you guys, do you not watch TV?"
Castle says to Beckett that he didn't want to tell Alexis about their secret romance, but his mother "used her Jedi mind tricks" on him.
Castle wants to have "An Indiana Jones moment"
Castle uses the catchphrase "Challenge excepted"