George Reeves (Clark Kent / Superman) was the only actor to appear in all 104 episodes of the series.
With the death of Noel Neill on July 3, 2016, Phyllis Coates was the last surviving regular cast member of the series until her death on October 11, 2023 at the age of 96.
John Hamilton, who played Perry White, had trouble remembering his lines. The solution was to film him sitting at his desk, with the desk littered with papers--including the script--so he could glance down to be prompted for his next line.
After George Reeves' death, producers considered continuing the series with Jimmy Olsen becoming the main character and including stock footage of Reeves as Superman. Jack Larson, however, rejected the idea.
When the series was filmed in black and white during its first two seasons, George Reeves wore a brown for red, gray for blue and white for yellow costume. When the show began filming in color in 1954, he switched to the trademark red and blue suit.