Well, books 1 and 2 were very different and didn't really contain anything that could be considered remotely similar twists IMO. But there are a ton of prequels and sequels and stuff made after the original trilogy that I'm probably not gonna read and that as far as I know Asimov kinda didn't intend to write, so it sounds entirely likely that some of those were phoned in lol
all I remember from reading the foundation series when I was 14 years old is that he uses the exact same plot twist in like three separate books
Well, books 1 and 2 were very different and didn't really contain anything that could be considered remotely similar twists IMO. But there are a ton of prequels and sequels and stuff made after the original trilogy that I'm probably not gonna read and that as far as I know Asimov kinda didn't intend to write, so it sounds entirely likely that some of those were phoned in lol