Import chokes when there is a dash (-) in a quote, such as:
'I like rice. Rice is great if you're hungry and want 2000 of something.' -- Mitch Hedberg (American comic. 24 February 1968 – 29 March 2005)
Oddly, it's fine with the double-dash -- but not with the single dash. Escaping it like this - doesn't help.
I tried replacing with an n dash and an em dash, but that didn't help, either, oddly.
The import also hates any accents. That made it tough; I was importing 900 quotes about food, and there's a lot of French accents happening when you are talking about food.
I ended up having to do the import in batches of 3's, 7, 10s, etc and as it refused to import, examine each batch to see what was making it unhappy this time.
Oddly, my JSON formatting passed all JSON linters with flying colours! Oh well!