The mini series was an exceptionally good depiction of the case and true to the book it was based on called ‘The people vs O J Simpson’ by Jeffrey Toobin which is worth reading, the author concentrates on the facts, the DNA and witness statements to put Simpson at the murder scene.
One piece of evidence at the original trial, the size 12 footprint in the blood at the murder scene proved to be crucial to establishing Simpson’s guilt at the subsequent civil trial.
At the time of the first trial it couldn’t be established whether Simpson, who takes a size 12, owned this particular pair of shoes called Bruno Maglis - at the civil trial it was established that only 299 pairs had been sold in the USA.
Simpson denied owning a pair, saying he wouldn’t wear an ugly shoe like that, the lawyer then showed him a photograph of Simpson wearing the shoes at a Buffalo Bills football game 9 months before the murder. ‘The image is fake, it’s been doctored to show a smoking gun’ said Simpson’s lawyers.
31 further images were sent in from the same game, ‘Are they all fake too?’ Asked the prosecutor. It’s a long time since I’ve read Toobin’s book but I recall they eventually tracked down a receipt for a pair of Bruno Maglis (size 12) that was linked to Simpson’s credit card.
https://www.highsnobiety.com/p/oj-simpson-bruno-magli-guilty/