: Bob Newhart returns in his Emmy-winning role as Arthur Jeffries (Professor Proton).
: This episode marks the first time Sheldon and Amy (Shamy) are intimate after more than five years of dating. Sheldon even admits he enjoyed the experience more than he expected.
: It is often cited as the best episode of the entire series by fans and critics, holding a high 9.2 rating on platforms like IMDb.
: For Amy’s birthday, Sheldon decides to forgo the opening night of Star Wars: The Force Awakens to spend the night with her. With encouragement from the late Professor Proton (appearing as a "Jedi" ghost in his dreams), Sheldon decides to finally have coitus with Amy.