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

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

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Barefooter25 · 46-50, M

Have you seen the ending credits for the 80s tv series Police Squad? 😆😅😄[media=https://www.youtube.com/watch?v=0tXrAkkTcWE]

AlasPoorYorick · 51-55, M

Yep!!! Loved it!! @Barefooter25