The case pits two of the world’s best-known technology companies against each other, but it hasn’t all been serious allegations and rebuttals

SAN FRANCISCO—A federal trial featuring two heavyweight technology companies is intriguing on its own. Toss in an unpredictable judge, A-list witnesses and some warlike rhetoric, and the legal battle between Alphabet Inc.’s Waymo and Uber Technologies Inc. turns into a spectacle that offers a revealing look into Silicon Valley culture and personalities.

On Thursday, as the fourth day began in a trial expected to last at least two weeks, neither party has notched any obvious big wins, but the proceedings have produced moments...



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