Watch all the frames in the animation by having two specific settings in scratch addons. Hold Alt and press the green flag at the same time to see the project in 60 FPS !
You will need Scratch addons and a display that supports 60Hz or higher. Go to Scratch Addons > Type in 'FPS' in the search bar and click either from just one or two options that say FPS counter (optional but beneficial) and mainly click on 'Higher project framerate mode' and enable graphics acceleration in your browser. Enjoy the difference !