The Grateful Dead are celebrating 50 years together with a series of final concerts this summer, but other golden-anniversary projects are spotlighting individual members. The Dead’s rhythm guitarist and singer Bob Weir gets a life and career retrospective in the new documentary film “The Other One: The Long, Strange Trip of Bob Weir.” The movie, directed by Mike Fleiss, premiered at the Tribeca Film Festival last year and is being released on Netflix on May 22.

Weir was the baby of the bunch, still a teenager when the band...