A two-hour Friday night block of family sitcoms hosted by the various stars of the shows, TGIF was often supplemented with animation, running skits and short gags.
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In the early years, the interstitial segments were shot at the end of the night, after the casts had finished filming their respective shows. TGIF producers had to work closely with the crews of all of the shows and know precisely when they would air in order to keep continuity. After the acquisition of ABC by Disney in 1996, the interstitials became less episode-specific and they were often shot on location or in front of blue-screens. See more
Referenced in Nostalgia Critic: Mamma Mia!