Wicked

Optimus Prime said
If I'm understanding correctly this wasn't a disclaimer shown prior to the movie but a website that does deep dives into content

Now the 70s was definitely a different time, but if there was something called Family TV Viewing at the time maybe it would have mentioned the arson or rapist
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Trust me, Little House was the definition of Family TV Viewing in the 70s. But yes, it was a very different time.

The closest we got to a trigger warning was the blurb in TV Guide that would say something like "The town deals with an incident at the blind school."