- At the end of the series, Starr kills Hoover and Featherstone in a seemingly tragic and pointless scene...except that if you think about it, they were the only people who could have started the Grail up again. They had to die.
- At first, fans thought the revelations of Cassidy being a brutal, selfish monster was a complete 180 on the character. But looking back, it was all obvious, he was always this way and just hit it under the veneer of a loveable rogue. But between his drinking, his antics and his often sharp temper, the signs were all there which is why Jesse believes it when he finds the truth.
- Just look at his behavior in his special and that alone was a major warning sign.
- Also, at the end of the "Reaver Cleaver" storyline, Cassidy's line about having a friend make you trust and love you before they ultimately betray you is not just Cassidy's bitter take on what happened, but serves as a nice, subtle bit of Foreshadowing for Cassidy's subsequent reveal. Jesse even lampShades this, recalling it during their final confrontation.
- God and Cassidy are Not So Different: pretty much two peas in a pod when you get down to it. Both are powerful, immortal beings, selfish and ultimately insecure, recklessly indulging their desires and impulses with little care for the ruined lives left in their wake. Both prey on people. Both are defined by a need to make others love them, and will often respond with anger, scheming, subtle manipulation and outright violence to get their way. This parallel characterization of Proinsias Cassidy and God Almighty is subtly lampshaded in Cassidy's final letter to Jesse Custer, where he attests that perhaps the ultimate goal of Jesse's quest wasn't to find God, but to save Cassidy. This theory, as well as the notion of the fundamental similarity of God and Cassidy, seems to be borne out, as Jesse is ultimately able to help his friend redeem himself and survive, but helps set up the irredeemable and totally unrepentant God Almighty for his just and final retribution at the hands of the Saint of Killers. Because he finally owns up to what he's done and who he is, and genuinely seeks atonement, Cassidy learns his lesson and the Preacher is thus able to covert and save him, but God, who at no point shows remorse or even the slightest doubt of the righteousness of his actions, dies because He does not.
- The old wino, who turns out to be Cassidy's formerly beautiful blonde friend Sally, was by all indications a smart, savvy woman with a good (and gorgeous) head on her shoulders. She was sharp enough to see Cassidy for what he was right away, and strong-willed enough not to fall for his bullshit, unlike just about everyone else in this narrative. One has to wonder what horrific tragedies and catastrophic downturns she suffered to turn her into the sickly, decrepit shell of a human being she is when we first meet her.
- Word of God is that Cassidy surviving being shot by the Saint of Killers's guns is Early Installment Weirdness as Garth Ennis hadn't yet worked out all of the specifics surrounding the Saint (namely, that each triggerfire is supposed to be a magical Instant Death Bullet). But unlike all of the Saint's other intended victims (up to and including God Himself), Cassidy is already dead! Thus, the massive physical damage done by the Saint's guns isn't instantly fatal.
Fridge / Preacher