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Dueling Shows: ABC's Webster [1983-89], starring Emmanuel Lewis as the Gary Coleman equivalent. It even had its own Channel Hop to syndication for its final two years.
Edited for Syndication: The broadcast syndication versions of Diff'rent Strokes (which are also the versions seen on Antenna TV since 2013) feature fairly noticeable (and to some extent, poor) edits for time constraints: the most glaring are the season three episode "The Older Man", in which both a scene dissolve and a wipe take place at almost the same time while transitioning to a scene in which a 25-year-old man who is dating Kimberly ( due to her being mistaken for a 20-year-old, while dressed in makeup and costume for a school play) arrives at the penthouse to take Kimberly out on their date; the episode "The Athlete" from the same season, features a brief clip of a scene in which Willis teaches Kimberly a dance move, which then abruptly switches only two seconds later to the scene in which Willis gets his acceptance letter to Fillmore High ( as promised to him by that school's shady baseball coach, who uses his sister's address to get most of his recruits accepted into the school).
The Other Darrin: Mary Ann Mobley replaced Dixie Carter as Maggie McKinney, the woman who marries Mr. Drummond in the show's seventh season, when Carter left to play Julia Sugarbaker on Designing Women.