Avengers: Age Of Ultron - 32 Easter Eggs, In-Jokes And References

Though Sebastien Stan didn't make the rumoured cameo (come on, the film is already 2 hours and 22 minutes long, where would he go?), there was one brief nod to the fact that Cap is still looking for him.

After the opening battle sequence, Cap shoots the breeze with Sam Wilson (Falcon) - who handily explains that he wasn't involved because "avenging is your thing" - and the pair mention the ongoing missing person's case.

Quite how the destruction of Strucker's base will impact Bucky's story remains to be seen, given that he's on a journey to find himself where he was "made", but he's presumably likely to turn up at the start of Civil War.