The paragraphs in the newspaper article in Ellen's scrapbook (shown after the photo of the child who died in the auto accident) repeat at least three times.
When Darlene gets a text, a close up of her phone shows she already replied. Then, the scene cuts to her typing in the reply and reading what was already shown verbatim.
When the unsubs are talking to their last victim, at one point, of them draws a revolver on him, and we hear the sound of the gun cocking. However, the gun the unsub is using does not have a hammer and thus cannot be cocked.