In a subtle and quick reference to the wider Marvel Cinematic Universe, there’s a shot within the 100th episode that shows two masks resembling both Iron Man and The Incredible Hulk. In Spider-Man: Homecoming, some thugs that were robbing a bank wore “Avengers” masks that looked a lot like the ones depicted in the shop window.
There are also action figures of both Thor and Hawkeye. The former is actually wielding Heimdall’s sword as opposed to his trusty hammer, Mjölnir. The Bifrost blade is typically known to be in possession of Heimdall, but the god of thunder has been shown to be carrying Hofund instead.
The other Easter eggs have some tie with Phil Coulson as a character. One of the references was the cello, which suggested Coulson’s friendship and romance with cellist Audrey Nathan. Unfortunately, Coulson was stabbed and killed by Loki before the relationship between him and Nathan could fully mature.
The ax is in reference to Coulson touching the Inhuman Obelisk and having his life saved by Mack who chopped off his hand. The model airplane appears to be a S.H.I.E.L.D. Globemaster model which Coulson kept on board the bus during the show’s first season.
The red hoverboard could be a nod to Coulson’s automobile, Lola, which can transform into a hover mode. The baseball card is a reference to Rosalind Price, another of Coulson’s love interests gone wrong. The Grumpy Cat mug was in reference to Fitz putting it aboard the bus in the first season and Coulson calling it out in the episode “FZZT.”
Agents of S.H.I.E.L.D. will be continuing on Friday, March 16th with Episode 101 entitled “Principia” at 9 pm on ABC.