When they open the map to luke skywalker: https://www.youtube.com/watch?v=DPBvMsT3prg
Intercut SNL’s Undercover Boss (https://www.youtube.com/watch?v=FaOSCASqLsE) into the film, probably in between Rathars and Maz’s Castle. Keep cutting back to Rey and Finn though as if this is actually part of the movie.
Have Luke Skywalker pop up in the background throughout the film, fading in and out. He is force projecting, but no one notices.
When the resistance arrives to destroy Starkiller Base play Red and Gold squadrons arriving at the Death Star instead. Someone says “wait wrong movie” and switches back. Because ANH and TFA are so similar they’re interchangeable.