When Norm hacks the overseer's terminal, he uses the same hacking mini-game that is used in the games.
The Red Rocket Station is very similar to the one found in the game Fallout 4 at the outskirts of Sanctuary Hills: the Red Rocket sign is missing the same letters (D, C and T) and the sign showing the coolant price list is exactly the same (same prices and same missing parts of the numbers).
The Ghoul calls the dog "Dogmeat", which is the name of a dog you can encounter in every Fallout game except Fallout: New Vegas (2010). Lana 5 is a Belgian Malinois. In Fallout 4 (2015), Dogmeat is also found at a Red Rocket truck stop.
When Thaddeus turns on the radio it makes the same noise the Pip-Boy makes when you select the radio function in the games.
When Thaddeus is listening to the radio it plays a song you hear in Fallout 4 when listening to Minuteman Radio.