Why do 70s tv shows end with the main character smiling or laughing, then the scene freezes, and the credits roll?

[youtube=https://www.youtube.com/watch?v=mw_wUye23OA]
CHiPs and Wonder Woman were the worst perpetrators ...

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Quizzical · 46-50, M

The very best of those were at the end of Police Squad 😆

AlasPoorYorick · 51-55, M

Yes, they definitely made fun of that!!! @Quizzical