The recommendations are certainly bizarre. Here's how IMBD says it selects them:
How do the recommendations work?
With nearly 788,000 titles on the IMDb it isn't feasible to handpick Recommendations for every film. That's why we came up with a
complex formula to suggest titles that fit along with the selected film and, most importantly, let our trusted user base steer those selections. The formula uses factors such as user votes, genre, title, keywords, and, most importantly, user recommendations themselves to generate an automatic response.
I'm wondering about that complex formula.
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