The wedding party in Washington takes place circa 1883, while Chester A. Arthur was president, but the establishing shot of the Capitol shows contemporary 1932 automobiles parked out front.
(at around 40 mins) When Yates and Lily are first getting close to each other in her new digs, Lily is sitting on the back of a sofa. In the closing two-shot of the scene, the shadow of the boom microphone is visible moving up and down on the wall behind them.