The hankie in Doris' left hand when she's "crying" in Sherman's apartment near the beginning appears and disappears between two different camera angles.
The binoculars in Doris's hand turn around between shots.
At the very beginning, Doris huddles in a doorway to get out of the rain. As a bus pulls up to the kerb, she starts to walk towards it, but in the next tighter shot Doris still in the doorway. The next shot, back on the street, Doris is already on her way towards the bus.
The close-up shot of the adult film poster Felix sees Doris on does not match the long shot which precedes it. In the long shot, the cast and crew info is on the bottom of the poster. In the close-up, the cast and crew info appears on the top.
When Doris is playing the piano at the Weyderhaus', her hands do not match the music.