Prop bets for Super Bowl LVIII include wagers on non-football-related topics like Taylor Swift, Usher's halftime show, and TV commercials. Prop betting is popular as it adds novelty and entertainment value beyond game outcomes. Bets center around Swift's appearances, a potential pregnancy announcement with boyfriend Travis Kelce, and if they'll kiss post-game. Usher-related bets focus on the first song, outfits like shoe brands, the use of sunglasses, and backup dancers.