Other mistake: When Eddie does her first liquor store robbery in Wady she shoots at the cashier because he looks at the gun that's placed under the cash register. We get the impression that she spots the gun too, but she doesn't bend over the counter enough to be able to see it. (00:30:35)
Other mistake: Eddie describes her brain tumor as inoperable because her brain wraps itself around it like jellyfish. The German subtitles translate 'jellyfish' into 'eel in jelly'. (00:37:20)
Chosen answer: Just my opinion: Mae Mercer is a great jazz singer - and there is a soundtrack of this movie, just in case someone wants to check it out - and I am sure she was the one singing.