I wanna clarify: It's impossible to remix after clicking the green flag, also it's pretty difficult to press 'see inside' whether the green flag is clicked or not without your computer getting a little dose of scratch crashing :)
If you press see inside then it'll detect a fast mouse movement and crash your game. I also have stuff that will crash your game (if the green flag is clicked) when you try to press the remix button or share button. If you do manage to click see inside, it'll automatically run the scripts and make it so if you press the share button inside the project, click the green flag while inside the project, or try to press 'project page' to leave it'll also crash scratch.