A representative for the Betsy Crocker Company threatens to sue because Screech's sauce is made from a recipe in the Betsy Crocker Cookbook. This does not make sense. While a food recipe could in theory be protected under trade secret law, it must be kept secret to be afforded any protection. The fact that Betsy Crocker published the recipe in their cookbook would mean it is not a secret and so anyone could freely use it.
After Screech breaks the machine the gang are using to bottle the spaghetti sauce, he places a beaker on the line and it breaks instantly, revealing that it is made of breakable candy glass.