Treading water on television is a good way to not be on television anymore, as we learn from this week’s movie trio about TV institutions getting new life through new blood. In the new office comedy “Late Night,” Mindy Kaling shakes up a white, apolitical late show, just as Rachel McAdams saves a GMA knock-off in “Morning Glory” and Christina Applegate rocks an absurdist boys club in “Anchorman.” Change is good, these movies tell us, but do they apply the same lessons to themselves? Let’s watch.

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