Bet spreads that attract attention typically involve unusually large wagers compared to the average betting patterns for a specific game or event. Significant shifts in betting lines, particularly if they occur shortly before game time, can raise red flags. Additionally, spreads that deviate from public consensus or align closely with insider information can also attract scrutiny. Notably, bets on less popular markets or those placed by known sharp players often catch the eye of sportsbooks, prompting them to investigate further.