Michael Schneider Variety Editor at LargeIf the idea of Kevin Hart as Arnold Jackson — the 8-year-old played by Gary Coleman on “Diff’rent Strokes’ — sounds perfect on paper, wait until you see tonight’s “Live in Front of a Studio Audience.” When the 5’4” Hart stands next to the 6’4” John Lithgow — who fills Conrad Bain’s role as Arnold’s adoptive father, Mr.
Drummond — the casting is about as spot-on as anything “Live” has done in the past.And then, when Hart leaps into Lithgow’s lap at one point, expect the live studio audience to erupt.
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