First off, rest in peace, Grant Tinker. He was a TV producer who became an NBC executive and helped keep on the air certain low-rated shows that became classic, powerhouse audience favorites, such as Cheers and Hill Street Blues. Before that, Tinker and his then-wife Mary Tyler Moore founded MTM Enterprises, which did the smartassed thing of creating a logo that parodied the epic MGM "Leo the Lion" logo. Several of the company's shows revised the logo to better fit each show (like Steven Bochco's short-lived Bay City Blues, about an minor-league baseball team): at least one individual episode, the 1990 series finale of Newhart, redid the logo for a one-time special reason.
Here, to have something light, are a bunch of those logos.