
Trivia: Paul Soles, who portrays the character Stanley, was the voice of Dr. Bruce Banner for the 1966 cartoon of The Incredible Hulk. The name "Stanley" is itself likely a reference to Hulk co-creator Stan Lee.

Trivia: Spoilers! Red Skull makes his long-awaited return to the MCU after his appearance in Captain America: The First Avenger. We discover that he's been guarding the soul stone as punishment, of sorts. However he's played by Ross Marquand, not Hugo Weaving.
Jon Sandys

Trivia: Robert Downey Jr. was the only member of the cast who was allowed to read the entire script.

Trivia: When all the Avengers are attempting to lift Thor's hammer, Captain America is able to move it slightly. In the comics, Cap is one of the few characters noble enough to be able to lift Thor's hammer (notable others being Storm and Beta Ray Bill).
Phaneron

Trivia: SPOILER: At the end on Nick Fury's gravestone, under his name is the passage from Ezekiel 25:17: "The path of the righteous man is beset..." This was the start of a big monologue made famous by Samuel L Jackson in Pulp Fiction. (01:59:25)
GalahadFairlight
Trivia: Samuel Jackson spotted that the eye patch his character wears in the movie switched eyes in the promotional posters announcing the movie in Los Angeles.

Trivia: Some of the members of Captain America's wartime elite squad are taken from Marvel Comics WWII based "Sgt Nick Fury and the Howling Commandos" - such as Dum Dum Duggan and Gabe Jones.
ComicBoyTrivia: While on the helicarrier, Tony Stark is wearing a Black Sabbath T-shirt, the band who released the song "Iron Man".
Bishop73
Trivia: When Thor is strapped in the chair we can hear the music from the original Charlie and the Chocolate Factory; specifically an instrumental version of Pure Imagination.

Trivia: Once again, Stan Lee makes his usual cameo. This time, he appears as a judge at the Christmas pageant. (01:03:50)
Casual Person
Trivia: The sorcerors' WiFi password, Shamballa, is a reference to the 1986 Doctor Strange graphic novel "Into Shamballa."
oswal13
Trivia: During the film's climax, a young boy in an Iron Man mask is shown standing up to one of the Hammer drones with Iron Man swooping in and destroying the drone and giving the kid the credit. Following Spider-Man's inclusion in the Marvel Cinematic Universe, a fan theory suggested the young boy was Peter Parker, which Marvel Studios President Kevin Feige and Spider-Man actor Tom Holland would later retroactively confirm.
Phaneron

Trivia: Stan Lee makes his customary appearance when Rocket Raccoon is sweeping the plaza for likely targets - he is seen chatting up a young lady. (00:16:00)
GalahadFairlight
Trivia: The first Marvel film released after Stan Lee's death. In tribute, the usual opening ident, which has the comic book characters in the Marvel Studios logo, instead shows multiple images of Stan Lee.

Trivia: Notice they don't play the lyrics with the "Iron Man" song in the closing credits. That's because the Black Sabbath song was not about the comic book Iron Man. There are many theories about what the song means, but the most popular is that it is about a man who travels to the future and sees the apocalypse. They couldn't use the lyrics to describe the Iron Man in the movie: He was turned to steel - In the great magnetic field - Where he traveled time - For the future of mankind. Now the time is here - For Iron Man to spread fear - Vengeance from the grave - Kills the people he once saved.

Trivia: Hang around right until the very end of the credits for a scene which further ties in Thor to a future Avengers movie.
GalahadFairlight
Trivia: Vin Diesel was given a special "Groot" version of the script that contained "translations" of what Groot was actually saying whenever he utters his one and only repeated sentence "I am Groot." This was done to help him deliver his dialog appropriately, since he would know exactly what point Groot was trying to get across with each line. Reportedly, only Diesel was given this version of the script - in everyone else's script, Groot's dialog is merely "I am Groot" over and over again.

Trivia: Jennifer Connelly voices the "suit lady", the AI in Spider-Man's suit. In real life she's married to Paul Bettany, who voiced Jarvis, the AI in Iron Man's suit, and who later played Vision.
Jon Sandys