In the discussion in the car immediately after the Polynesian restaurant gig, Jack is wearing his tuxedo. They were wearing Hawaiian shirts on the gig however.
When Jack seduces Suzie after the New Year's Eve gig, the strap of her dress falls down twice.
When Frank, Jack and Susie get underway for the trip to the New Year's event at the resort hotel (a.k.a. Bill Gate's house), they are first shown driving southbound on the Mercer Street onramp to Interstate-5. Then the scene shifts to them driving near the Spokane Street exit southbound, five miles to the south. Then the scene shifts back to them driving emerging from a tunnel, which is actually the same southbound I-5 onramp, only a little farther past the initial shot.
When Frank rushes Susie to a store to buy an appropriate dress for her first performance, the price tag on the black dress is at the back of the dress by her neck. In the kitchen of the cocktail lounge, the price tag is at the side of the dress by her waist.
When Jack and Nina have whisky and milk, Jack's glass swaps from his right hand to his left mid-toast.
After Jack leaves the restaurant in the early morning, Jack returns home and tries to console Nina on the roof of their apartment. The sun, however, is not rising early in the morning, it is setting, since the view is looking to the north along First Avenue and the setting sun is to the west.
After Susie and Jack finish playing "Making Whoopee," as the crowd is shown applauding enthusiastically, one extra at a table was not clapping, but suddenly began when he realized the camera was on him.
When the little girl comes in through the window and tells Susie she "came down to walk Eddie", she goes out the door without the dog leash. The leash is clearly visible hanging on a peg right next to the door.
During the fight scene in the alley there is a crew member fully visible for a very short time.
Have a picture of actual cameraman in scene.
When Jack goes to Frank's house, he is dropped off by a cab from the "Bay City Cab Co." However, the movie takes place in Seattle, not San Francisco (the Bay City).