About those back marks...*Spoilers*
I know that they're supposed to represent the number of guys that the Billy/Bonnie tag team ripped off money from, but to what degree? I mean did Bonnie just drain their bank accounts before moving on to the next victim, or did she become a "rich widow" before the plan to kill Luis? Could they have killed any of the previous husbands?
Anyway, I hope that I'm not overanalyzing this movie.