The original working title was Avengers: Half as Good, but Kevin Feige thought that might invite trolls.
Had the Disney/Fox merger occurred sooner, Thanos would have been revealed to be the Stepford Cuckoos in a warped Grimace costume.
An early draft had Groot running away with Squirrel Girl in a post-credits scene.
Per NSPCA records, only one animal was harmed during filming: a raccoon who broke his leg jumping up and down, trying to see Rocket on the set. He made a full recovery and eventually hit in the winning run in his town’s little league championship game.
The Russo brothers have matching tattoos of Iron Man peeing in the corner of his space escape pod.