The number on Owen's shirt is 1, which is also his number at the experiment in real life. More than that, all visible numbers in this episodes (license plates etc) are 1 or 9, nine being Annie's number.
The Fish and Wildlife officer, Agent Lopez, is the same person who appeared as a security guard at the Milgrim building in episode 1. He uses the line "Not much difference, authority-wise" in both episodes.
Owen is not only wearing a jersey of Houston Oilers quarterback Warren Moon but also has the last name Marino, the last name of another star quarterback (Miami Dolphins) in the NFL at that time.
When Owen is reading Dr. Greta's book before the semi-truck drives by, it mentions Olivia Meadows who he screamed at in his memory from episode 3.
The jersey Owen wears is of Warren Moon, the quarterback of the Houston Oilers from 1984-93.