Sally, the oldest-looking teenager with the dark braided hair, closes the door to the undressing room twice: first when the girls enter, then as they start stripping down.
During the party, the girls leave the main room twice.
The positions of Burma's hands when she is visiting her panicking female customer keep changing.
Several years pass between Burma giving up her baby and kidnapping her sister's 6- or 7-year-old child. If the film is set in present day (1936), the kids in the earlier scenes should be drinking at a speakeasy, not a bar, as Prohibition (which ended in 1933) would still have been in effect. It's especially unlikely that the bar/speakeasy would have a sign advertising 5-cent beer.
The music heard in the opening scenes at the bar includes several trumpet/horn notes, but no musicians playing those instruments are seen among the band members. A cellist and a pianist are both seen (the pianist's hands are seen in closeup, which may be stock footage from another film), but neither instrument is heard on the soundtrack.
At the party, after one of the guys says, "Coming right up", a woman sitting on the couch says "I hope not!", but her lips do not move.
When Burma goes to see Tony and he gives her a doped drink, the shadow of the mic falls across him.
In typing out the police report for the "stolen" ring, "Blondie's" height is listed as 4 ft. 3 in.