26Robert Downey Jr.
Robert Downey Jr. has actually been banned from Japan because of his erratic behavior in the US in the 1990s and was only allowed to enter Japan for the premiere of ‘Iron Man’ if he promised never to return again. - Source
27. Deadpool is immortal in the comics because Thanos wants to keep him away from Death in the afterlife.
28. It is a common misconception that Cyclops of ‘The X-Men’ comic series possesses the power of heat vision. He actually projects a powerful beam of concussive energy, which feels more like a strong punch than a ray of heat. - Source
29. After his secret identity as Daredevil was released to the public, Matt Murdock occasionally wore a shirt with the phrase “I’m not Daredevil” printed on it. - Source
30. Though he still maintained his peak physical condition, in the early 1990s, Captain America had the Super Soldier Serum removed from his body as a statement against substance abuse. This only lasted six issues before it was retconned away. - Source
Almost anytime Mystique is depicted in clothes in X-men comics, she’s really just naked and generating outfits with her shape-shifting mutation. - Source
32. Despite Netflix’s Luke Cage television series and Captain America: Civil War both being released in 2016, and set in the same cinematic continuity, Alfre Woodard appears in both as two unrelated yet significant characters. In Luke Cage, Woodard appears as primary antagonist Mariah Dillard, while in Captain America: Civil War, she portrays Miriam Sharpe, the woman that convinces Tony Stark that the Avengers do more harm than good. - Source
33. Stan Lee had originally planned for Professor X to be the brother of his arch-nemesis. - Source
34. ‘Thor’ was originally planned to be a made-for-television film set to air on UPN, starring professional wrestler Tyler Mane. - Source
35. In “Avengers X-Sanction #4”, the time-traveling mutant Cable notes that Spider-Man is seen in the future as the greatest hero of all-time, even more so than Captain America or Iron Man.
In a deleted scene from the 2008 film ‘The Incredible Hulk’, in which Bruce Banner goes to the Arctic to commit suicide, Captain America’s body and shield can be spotted frozen beneath the ice. - Source
37. Stan Lee was actually very nervous that blind people would find his ‘Daredevil’ comic series offensive or parodical. Upon its release, however, he received fan mail praising his handling of the subject and asked him to contribute to charities for the blind. - Source
38. Due to FOX’s strict censorship of violence in cartoons of the 1990s, Spider-Man only threw three punches in the entire four-year run of ‘Spider-Man: The Animated Series.’ - Source
39. In “The Ultimates #4”, published in 2002, Nick Fury and Ultimate universe version of the Avengers sit around and discuss what actors could play themselves if their story is ever made into a film. It’s suggested that Brad Pitt could portray Captain America, Steve Buscemi as Bruce Banner, Matthew McConaughey as Giant-Man, Lucy Liu as the Wasp, Johnny Depp as Tony Stark and Samuel L. Jackson could play Nick Fury. - Source
40. Mark Ruffalo actually discussed playing Bruce Banner with the director of the 2008 film ‘The Incredible Hulk’, but Marvel did not believe he would be right for the role.
Spider-Man was accidentally called Peter Palmer twice in the very first issue of ‘The Amazing Spider-Man’ comic book. - Source
42. The original opening scene of ‘Iron Man 2’ featured Tony Stark in the Iron Man suit, suffering from a hangover and vomiting into a toilet. This was removed to make Stark’s first appearance much more heroic. - Source
43. Deadpool has a sidekick. Bob, an agent of Hydra, joined Hydra for a steady job and dental plan. He has no superpowers or combat training and Deadpool brings him on dangerous missions for his own amusement. - Source
44. Chris Hemsworth was originally rejected for the part of the title character early on in the casting process for the 2011 ‘Thor’ movie. He was reconsidered only after his younger brother Liam was nixed further along in the process. - Source
45. Deadpool is multilingual, with the ability to speak fluently in German, Spanish, ASL(Sign Language) and Japanese, in addition to his native English and he is Omnisexual. "Deadpool is whatever sexual inclination his brain tells him he is in THAT moment. And then the moment passes." - Source
Some of the sound effect used for Tony Stark’s armor in the ‘Iron Man’ film series originate from 8-bit video games, such as the cannon fire from ‘Space Invaders’ being used as JARVIS’ target lock. - Source
47. Tom Morello, guitarist for the rock band Rage Against the Machine, makes a cameo appearance as the first terrorist guard killed by the title character in ‘Iron Man’. - Source
48. While the ‘X-Men’ comic series was originally developed as a simple tale of “Good vs. Evil,” various writers saw potential in the comic’s cast and story to delve into themes regarding the horrors of racism, religious fundamentalism, anti-Semitism, the red scare, the AIDS epidemic, and the struggle of the LGBT community - Source
49. After the very first ‘Fantastic Four’ comic was printed in 1961, many fans debated for decades if the Thing’s genitalia had remained the same after he mutated. In 2011, creator Stan Lee finally confirmed that the Thing had a penis made of orange rock. - Source
50. Spider-Man invented the web-shooter he uses to swing between buildings and catch criminals. The fluid inside, which forms the webbing, can hold 120 pounds per square millimeter and evaporates within an hour or two. - Source