At the Stark Expo in Captain America, one of the items on display is a stationary mannequin with the name Phineas Horton on the marquee above it. That mannequin is actually Jim Hammond, the original Human Torch. In the comics, Hammond is an android created by Horton that could control and surround himself with fire. He predated the Johnny Storm version of the Human Torch by decades.
This easter egg is great for a few reasons. First, in a bizarre coincidence, Chris Evans played Johnny Storm/Human Torch in the Fantastic Four movies, and he’s obviously playing Captain America here. And secondly, the original Human Torch was a WWII companion of Cap’s who, along with Namor and a few other heroes, comprised the All-Winners Squad.