The Marvel Cinematic Universe is one of the biggest movie franchises in modern cinema. It is jam-packed with A-list actors, weird and wonderful characters, amazing action and mind-blowing special effects - and yet one of the things that people enjoy most about it is trying to spot the fun little inclusions in each movie. Eagle-eyed viewers will always be on the lookout for references to other media, cameos, strange inclusions in the background and director nods in order to enhance their movie-viewing experience, even if they are irrelevant to the movie's plot or the wider universe. Ever since the first movie in the franchise - 2008's Iron Man - these fun additions to the Marvel Cinematic Universe have become more and more prominent, to the point that it's impossible not to spot at least some of them even when you're not actively looking for them. We've done numerous lists, here at WhatCulture.com, which pick the best examples from each individual movie and now, as we near the end of "phase two" of the franchise's adventure, we're going to put together a bigger list of the best ones from every movie to date. So, on that note, here are the twenty-five best - bearing in mind how fun they were or how much they matter in the grand scheme of things - Easter eggs and references in the Marvel Cinematic Universe to date (contains many Marvel Cinematic Universe spoilers)...
