I thought the writing was quite strong and captured the voices of both men.
The [spoiler] cross-time flashback was particularly nice.
I liked all the actors, but will call out two: Richard Malmos as the elder Hemingway was delightfully cranky. Hunter Saling as young Welles carried the right balance of bravado and talent.
What I didn't like
I did feel rather uncomfortable and distracted from the story when Hemingway pointed his rifle at me. Of course I realize I was not being singled out, and it was simply by chance that I was in his line of sight, but it was a disturbing moment for all the wrong reasons.
My overall impression
I enjoyed this show! Being a Welles fan it was fun catching the historic references of his life and career. I also liked the thematic through-line of bullfighting. An interesting series of vignettes that never became sloppy— I fear a lesser writer would have leaned into parody. Solid!