When Cathy asks Miss Willey if she heard anything from Chick or anybody; Cathy is holding her gloves with both her hands. But on the next cut when she goes toward the piano to get a telegram; she is now holding the gloves with just her right hand.
When Chick tells Cathy that Dan has left for San Francisco, she begins crying and holds a handkerchief with two hands to blow her nose. But on the next immediate cut, she is now holding the handkerchief with just one hand.
When Chick begins singing the verses on the song "Who Kill Er", you hear horn riffs playing in the background. But when it cuts to the horn players on stage, they are sitting still and not playing although you can hear the horns in the music.
When Dan arrives at the San Francisco apartment; Cathy is playing the piano. Throughout the scene, she plays the piano in synchronization with the audio of the piano however right before the kiss the piano sound stops but she continues playing the piano.