The show almost died out after a single season.
Facing stiff competition from Perry Mason, Bonanza would nearly get canned after a year. NBC held steady and shifted the starting up to get better ratings. It worked.
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Almost everybody wore a wig.
The show went on for so long that almost every lead actor had to wear a wig or toupee. The reason? Their hair started to thin out and change colors. Now that just sounds horrible, actually, what’s worse than horrible? Yeah, that.