>The heroes that vanished due to the Infinity Gauntlet are objectively and unironically dead.

>Using all the Infinity Stones at once is extremely difficult. Thanos was only able to do it for a second, and only survived because he is a Titan. Even then, the strain was so great that it destroyed the Infinity Gauntlet and briefly transported Thanos to the Soul World.

>The young Gamora that Thanos met in the Soul World was a “reflection” of her spirit.

>Thor purposefully aimed for Thanos’ chest so he could look Thanos in the eyes and gloat about his victory before finishing Thanos’ off. Thor’s mistake was equal to Star-Lord’s.

>Doctor Strange surrendered the Time Stone to Thanos as part of a greater plan.

>Thanos retrieves the Power Stone off-screen to avoid repetition and allow the movie to hit the ground running.

>Valkyrie survived Thanos’ attack and escaped with some of the Asgardians. No word on whether Korg survived as well.

>The Black Widow/Bruce Banner pairing is being swept under the rug, dismissed as an “unpopular decision by Joss Whedon”.

>The Hulk was benched to force Bruce Banner to be the hero for once, since always turning to the Hulk to bail him out made him look “whiny”.

>Red Skull was brought back because they felt audiences would respond better to all the exposition about the Soul Stone if it came from a familiar face that had already been involved with the Infinity Stones before.

>The SPIDER-MAN: HOMECOMING timeline mistake is being ignored. Canonically, it's been ten years between IRON MAN and AVENGERS: INFINITY WAR.

>The post-credits scene of AVENGERS: AGE OF ULTRON were Thanos is already in possession of the Infinity Gauntlet now retroactively took place in Nivadellir.

>Adam Warlock was never meant to appear.

>Chris Hemsworth asked the Russos to not write "the old Thor" and instead use the characterization he created with Taika Waititi for THOR: RAGNAROK.

>Mark Ruffalo deliberately played Banner as a dumbass, and wanted to act even more bumbling and awkward, but was told to reign it in.
>Groot's last "I am Groot" to Rocket was him saying "Dad..."

>There's a couple of deleted scenes, including a comedic sequence of the Guardians of the Galaxy trying to figure out where to go after Thanos abducts Gamora; Banner retrieving the Hulkbuster; Banner and Black Widow officially ending their relationship; A brief exchange between Captain America and Black Panther ahead of Wakanda's invasion; an extended sequence of Thor regaining his powers through Stormbreaker; and a series of flashbacks to Thanos' childhood in Titan, including his ostracization for being born with the Deviant Gene and his exile after advocating for culling half the population to prevent the end of his world.

>The money shot of the heroes – including the Hulk – charging in Wakanda was specifically created for the trailers to mislead the audience.

>Tom Holland only found out Spider-Man would die on the day they filmed his death scene. He improved Spider-Man’s desperate plea of “I don’t want to go”.

>The Russos are committed to "high stakes" for AVENGERS 4. It'll have a "game-changing ending" and whichever victories the heroes achieve will come "at great cost".

>The title for AVENGERS 4 hasn’t leaked yet. The closest guess was the rumored “Avengers Forever”.