The casting for 11 year old Cassie was amazing
That little girl looks like they went back in time and got an 11 year old Sydney Sweeney and came back with her and filmed her for the flashbacks
This pic says it all
https://poptonic.com/wp-content/uploads/2021/11/Kyra-Adler-and-Sydney-Sweeney-as-Cassie-in-Euphoria-1024x585.png.
Same eyebrows, same mouth, same teeth, same nose, same eyes, thats literally the best casting for a young version of an older character i've ever seen.