That night as I drove home, I was one happy camper. Per my contract on K-9, Siegel & Myers would receive a bonus on a sequel. My take: $150K. Talk about money for nothing! Cut to some months later when I’m informed that I will not be receiving said bonus. Why? Because when the original K-9 deal was made, our lawyer neglected to add four little words to the contract re sequels: “Or any other format.”
Source: The Business of Screenwriter: Get a damn good lawyer!