Harold the taxidermist having dinner with Spencer, A peeking at the Liars' room through a hole in the wall behind a picture frame, Hanna in the shower, and A getting analyzed by a psychiatrist are recreations of scenes from the movie.
creepy hotel and owner, taxidermy, shower scene, the peephole in the next room, Mona's inner dialogue wrapped in a blanket at the end of the episode, etc.