Re: Easter eggs?
Also, I don't really know if this counts as an "easter egg", but the gun Coulson is holding when he dies is the same gun he commissioned SHIELD scientists to create from their research on the Destroyer in the "Fury's Big Week" comic series!
Phase 1 >>> IM - TIH - IM2 - Thor - CA: TFA - The Avengers
Phase 2 >>> IM3 - Thor: TDW - CA: TWS - GotG - Avengers: Age of Ultron - Agents of SHIELD
Phase 3 >>> Ant-Man - Daredevil - Jessica Jones - Luke Cage - Iron Fist - The Defenders