Fair warning, this article contains minor SPOILERS for pretty every Marvel movie that came out BEFORE Avengers: Age of Ultron. Almost everything here is no big deal, but there's a pretty big one for The Amazing Spider-Man 2 on the third page. Like you were gonna watch that one anyway.
When we meet Steve Rogers in The Winter Soldier, he's still recovering from his 70-year journey to the present. He's an old-fashioned fish-out-of-water, like Austin Powers with a lot less body hair. In the opening scene we get to see Cap's notepad, which has a list of all the pop culture he wants to catch up on after decades on ice. In the US, that list includes Steve Jobs, the moon landing and I Love Lucy, but if you live in another country you might've seen a different version.
Despite being a hero named Captain America, Steve seems awfully interested in foreign media. For instance, in the UK, Cap's list includes Sean Connery and The Beatles, while Russia replaces those with famous historical figures that have a staggering amount of consonants.
The additions are a little strange, being that the movie is set in America, Steve Rogers is from America and his code name is Captain America, but that might be the exact reason that Marvel tried extra hard to appeal to foreign audiences. Whatever the case, Steve has no idea what he's getting into with Oldboy.
Dopey red suit aside, the new Daredevil TV series on Netflix is actually pretty good. The fight scenes are fantastic, the cast is mostly likable and overall the show doesn't feel like it cheats you by making the whole season an origin story. It's got the kind of quality you've come to expect from Marvel, including the fun easter eggs.
A lot of the secrets seem to hint towards what might come in the second season. For instance, in an Episode 10 flashback, a young Foggy mentions a "greek girl" that Matt was hung up on...
...which is a pretty clear reference to Elektra, the sometimes-villain who just happens to be Matt Murdock's ex-girlfriend from college. The fact that this mystery girl is Greek in particular solidifies the Elektra connection. Looks like we can all look forward to Marvel finally introducing another powerful and compelling female character (and then instantly killing her off).
Also potentially coming soon is Daredevil archnemesis Bullseye, as indicated by this playing card owned by one of Kingpin's snipers...
Playing cards have been Bullseye's schtick before Gambit learned to say "mon'amie," so it stands to reason that ace of spades isn't there for flavor. That said, it's a bit tougher to say whether that's actually Bullseye in the episode, or if that's just a wink to fans.
Either way, this was a bit less ambiguous...
Off to the left in the armor designer's workshop you can see what are clearly legs belonging to Stilt-Man, one of the lamest/most brilliant Marvel villains ever. Unlike Elektra and Bullseye, it seems a touch improbable that we'll ever see ol' Stilty on TV.
You might have given up looking for the traditional Stan Lee cameo after a few episodes, but he actually does show up in the very last chapter.
In his sneakiest cameo yet, Stan Lee and his lovable mug are hiding on the right. It's hard to read the plaque under the frame, but we have to assume it's something like "Person Who You Most Wish Was Your Grandpa."
A lot about comics doesn't translate well to the screen -- movies show you everything in motion, while comics make you imagine what's happening between panels. That, and red and blue spandex almost always looks sillier in real life. But sometimes movies manage to perfectly replicate a key page or panel from a comic in an especially ingenious way. Above you can see that the USO show bit in Captain America: The First Avenger perfectly mimics the cover to 1941's Captain America #1, which portrays the star-spangled hero punching Hitler in his god damned face.
If you've got a keen eye at the end of Thor 2, you can see Loki strike the pose he's known for in the comics world. Loki strikes a pose he's famous for.
Even low-tier Marvel movies have gotten in on the action, like the time the Ben Affleck Daredevil movie replicated Elektra's pivotal death scene.
And who can forget the only moment you remember from Superman Returns, which is a dead-ringer for the Man of Steel's first appearance in Action Comics #1?
Perhaps the best of all was in Spider-Toby 2, in which Peter quits being Spider-Man in the exact same fashion he did way back in Amazing Spider-Man #50.
If you got this far without furiously writing "Superman isn't Marvel!!!" in the comments, congratulations: You passed the test! Your reward is getting to read all of the knee-jerk reactions of the impatient commenters below.