Matthew Gilbert’s notes on the weekend’s TV offerings, including “The Girl” on Saturday at 6:25 p.m. on HBO2; “Boardwalk Empire” on Sunday at 9 p.m. on HBO; “Unlikely Animal Friends” on Saturday at 10 p.m. on National Geographic; “Liz & Dick” on Sunday at 9 p.m. on Lifetime; and “Downton Abbey Revisited” on Sunday at 8 p.m. on Channel 2.
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