10. Hulk Has A Chest Scar From His Fight With The Abomination - Thor: Ragnarok
Though the MCU largely downplays the existence of 2008's Edward Norton-starring The Incredible Hulk, The Hulk's re-design for Thor: Ragnarok did include one incredibly subtle reference to the solo romp, as uncovered by the fine folk at /r/MovieDetails.
Pay extremely close attention to the left-hand side of Hulk's chest and you'll notice a faint scarred mark, which just so happens to be in the exact same spot where Hulk was stabbed by Abomination in the climax of The Incredible Hulk.
Given the ludicrously detailed design of Ragnarok's Hulk, there's no way this is a mere coincidence - the wound site matches the scar perfectly.
Though the wound doesn't seem to be present in pre-Ragnarok iterations of Hulk, the character's subtle re-design for the movie clearly allowed the VFX artists to tinker around and impart their own stamp on the big green guy, continuity and all.
Though the scar is easily missed, if you've got a 4K copy of Ragnarok to hand, it's a little easier to spot.