The gag of Stark buying the bar and slating it for demolition falls a little flat, if you stop to consider how the bar staff would've lost their jobs and the locals, their chosen place to hang out for an evening.
A Funny Thing Happened on the Way to Thor's Hammer
Coulson's actions make even more sense when you think about the fact that police departments hate having to deal with dead bodies, especially ones with gunshot wounds. A couple of punks getting the snot beat out of them, on the other hand, will only get a mild investigation. Important when you are a busy agent needing to get back to work.
Additionally, he knows that if he did shoot them in the back, they might have still gotten off a shot, either at him or the cashier. The only way to ensure that this wouldn't happen would be to double-tap both of them, in the skull, from ten feet away, before either could turn around and either shoot him, or take the cashier hostage.
Not to mention how the robbers were standing between Coulson and the cashier. He really wouldn't want to risk her being struck by a missed, ricocheted, or through-and-through shot of his.
Item 47
Fridge Horror alert: With the reveal that Jasper Sitwell is under Hydra, who do Benny and Clare really answer to?
Even worse Fridge Horror alert: The background graphics from the closing credits show the evolution of weapon prototypes, from Benny's bodge-job on the Chitauri blaster to vehicular- and turret-mounted blast cannons. Looks like we know who made those targeted-assassination weapons on the robot helicarriers from Captain America: The Winter Soldier possible...
Agent Carter
In Agents of S.H.I.E.L.D., Agent Ward comments that "Someone really wanted our initials to spell S.H.I.E.L.D." When you learn that S.H.I.E.L.D. was set up by at least three people who worked alongside Captain America during World War II, you realize that yes, they probably really DID want the initials to spell S.H.I.E.L.D., in honor of their beloved friend, believed to be dead.