I've noticed some possible connections between the scene where Joe shoots Ed and the two others, and the one where Adam comes home to find Lorraine and her lover in bed.
After Joe accidentally shoots the woman through the wall, he walks next door to find her. If you notice the sign on the door, it reads: "Health+Plus Enzymes" "Natural Cell Stabilizers" "Cell activation" "Free radicals" and "Anti oxydants"
When Adam is about to walk into his house, the van has "Gene Clean" prominently featured on the truck. I believe that this has a double meaning. In addition to the name Gene and a cleaning business, this has to do with literally 'cleaning genes', as in human DNA, in the same way that "Health+Plus" promises cellular improvement.
In Diane's fantasy, these are symbols that she is trying to 'fix' what is wrong with her at her core being. But she fails. When Joe shoots the woman through the wall, she complains "Something bit me real bad." Diane's hit on Camilla came back to 'bite her on the you-know-what", forever ruining her to the core.
Strangely, 'Anti Oxydants' appears misspelled: Typically it is spelled anti-oxidant (with an i). Perhaps this is an accident. Or maybe, because oxydant sounds so much like accident, that this fantasy represents her idea of an anti-accident--that is, something that can fix the mess the terrible event led to. Sadly, what little hope there is of fixing it dies with the woman in that room. She puts up a struggle but is soon dead.
The man with the vacuum cleaner, another reference to cleaning, watches helplessly and is also killed.
Later, Adam finds his wife in bed with Gene Clean. He's been betrayed by his wife, and soon after Gene punches him in the face. (As an aside: Before that, though, he glances at something in the kitchen, and finds the paint in the garage. While looking over the shelf, we see a bucket of primer, called "Break Through". Not sure what this could represent, but he ignores this in favor of the pink paint. Maybe if he had chosen differently, the resolution of Diane's fantasy may have turned out differently? Or perhaps this is a symbolic message to the viewer that things are at a turning point. And what did he pause for that brief moment to look at on the shelf in the kitchen?)
As Adam drives away, we see another representation of the vacuum guy, this time another man is watching helplessly while raking leaves.


