During Red Hulk's attack on the Helicarrier, the names O'Grady and McCarthy can be heard. Eric O'Grady and Chris McCarthy are both S.H.I.E.L.D. Agents who also both wore the Ant-Man suit.
During the Red Hulk attack, there is a conversation about the colors of the two hulks, including the line, "I heard it started out gray!" This is a reference to the first issue of the hulk comics before the character's signature skin tone was set as green. While originally this change was supposed to be ignored as an artifact of the publishing process, it was eventually made cannon.