>>213522401
There was an amusement park/carnival setting in Wednesday season 1 episode 1 too and also Pilgrim's world then too but it looks like it was expanded.
I can't think of what 90s mystery movies you mean though, I can only think of Final Destination 3?
Hellfest (2018) has a really authentic and kickass Hallowen amusement park setting though, you should watch it.