Continuity mistake: When Scooby puts down all the stuff he found in Wickle's' manor and Shaggy says those are just stuff Scooby wants, the toilet brush is on the left for Shaggy and it's standing up. When Scooby picks it up, he picks it up from Shaggy's left side, while it is slightly lying down. (00:21:25)
Revealing mistake: When Fred rushes in to fight the Black Knight Ghost in Mr. Wickles' castle, he is hit in the face several times with the back of his shield. As he falls, you can see the pad on the back of the shield to protect his face. (It is not noticeable when he first runs in.) (00:23:20)
Continuity mistake: When Shaggy gets out of the car on the red carpet, he has a drink in his hand with a straw, but when Scooby drinks out of the cup there is no straw. (00:02:30)
Answer: The simple answer is money. Although it has to do with film studios and distribution companies releasing American films to the international markets. Because of technology, studios can digitally alter products in the film and can now sell product placement rights more than once. This practice started with "Demolition Man", where in the US, Taco Bell is the only surviving fast food place. But, overseas, the restaurant is Pizza Hut. In "Scooby Doo 2", Burger King purchased the product placement rights for the film along with "right of first refusal." Burger King then decided to just focus on the U.S. plug. Warner Bros. Was free to sell the plug for the international market release, which KFC bought. So the DVD version was the domestic release version and the Netflix version is the international release. But, I do not have an answer to "why is Netflix showing the international release version?", but I'm sure it has to do with cost of purchasing the rights to stream, unless KFC also bought the product placement rights for streaming in all markets.
Bishop73