These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Here, Boomerang and Shocker are close friends and depend on each other throughout the story. In Superior Foes, Boomerang locks him in a car trunk and drives it off a pier.
In the comic, Abner Jenkins is viewed with a lot of resentment for joining the heroes, and Boomerang hates him. In this fic:
Shocker: [MACH-IV's] one of the few people I know who can hang with the heroes and still has cred with the bad guys.
Hilarious in Hindsight: Learning of Dormammu's involvement with the apocalypse nearly causes Boomerang to outright get the hell out of dodge. In Superior Foes, he's obsessed with the Dread Lord to the point of, imagining Dormammu as the best man at his wedding.