During the "War and Pieces" segment, when Bart and Milhouse kill enemy characters in the video game they're playing.
After the closing credits, when the Gracie Films card appears.
This is the second episode where Homer plays Drops and Rises. The first was Any Given Sundance.
It actually was 187 seconds between the words "Joel Cohen Will Die In 187 Seconds" and "As Predicted, Joel Cohen Just Died" in the opening credits as Joel H. Cohen is both a Co-Executive Producer and a Writer in this episode.
The answer to the puzzle on the Consternation box is "A Board Game Rip-Off."
In Tweenlight, Bart mentions that girls lust over him when he takes his shirt off. He does so, and his belly sags.
This is the second time Lisa escapes from becoming a vampire, because of Homer's "agreement" in being bitten instead of her. The first time was also in Treehouse of Horror IV, but because the episode ending started instants before Lisa was bitten.
Bart claims that when he takes his shirt off, girls become smitten. He takes his shirt off and his belly sags, and he walks away in shame.