1. In The Last Jedi, Finn and Rose go on a mission to find someone to help them disable the First Order's "hyperspace tracking"

undefined

As it so happens, in Rogue One Jyn Erso stumbles across "hyperspace tracking" while sifting through the Empire's plans

undefined

via kyleauxren



2. Early in The Force Awakens, Finn tells Rey to fly low to the ground to avoid detection by TIE Fighters

undefined

undefined

Later, when Poe and the Resistance show up to save the day, the X-Wing squads can be seen flying low, close to the water

undefined

via Glennishill



3. Mace Windu chopping off Jango Fett's head was one of the more memorable moments of Attack of the Clones

undefined

If you look closely in the shot immediately after the cut, you can see the shadow of Jango Fett's head falling out of his helmet

undefined

via judebot



4. In Return of the Jedi, in certain shots you can see Darth Vader holding two lightsabers. This is a byproduct of a deleted scene where Luke threw his weapon at Vader

undefined

As the story goes, the original plan was to have Luke and Vader switch lightsabers for a time. That would make sense out of an early Return of the Jedi poster (back when it was still Revenge of the Jedi), where Luke can be seen wielding a red saber

undefined

via dukys



5. In The Last Jedi, Finn's jacket has been stitched up where it was torn by Kylo Ren's lightsaber

undefined

via Gui1tyspark


6. When Rey is trying out her new blaster, you can see how inexperienced she is when she aims with the wrong eye open

undefined

via mrdrewc



7. When Luke fires on the Death Star at the end of A New Hope, you can see the charred surface where the previous X-Wing pilot missed his shot

undefined

via dcpanthersfan



8. There are numerous direct references to George Lucas' first film, THX 1138, hidden throughout the Star Wars series

undefined

In The Phantom Menace, one of the droids has "1138" written on its back. Roger roger

undefined

In A New Hope, Chewbacca is "transferred" from Cell Block 1138

undefined

A slightly sneakier reference can be seen in the Hoth scene in The Empire Strikes Back, when Rogues 11 and 28 are called out

undefined

It's tough to see in the movie itself, but if you zoom in on Leia's disguise in Return of the Jedi, 1138 is written on the side of her helmet

undefined



9. Rogue One digitally re-inserted pilots from A New Hope (which takes place very close to the same time period), even going so far as to bring in the old actors to record new lines

via MatiVoyager


10. Just before the General Grevious fight in Revenge of the Sith, you can see a droid nudge his buddy. "Hey dude, check this out, it's about to go down"

via MatiVoyager


11. Also in Revenge of the Sith, you can see Obi-Wan's ship has a running killcount of the droid ships he's destroyed

undefined

undefined

via youknowabitjonsnow


12. One of the cooler bounty hunters from The Empire Strikes Back is the murder droid IG-88, seen at the center here

undefined

Funny enough, IG-88's head seems to be made of one of the props from the Cantina in A New Hope

undefined


13. During the big space battle in Return of the Jedi, you can hear one of the Rebels yell "So long, dickheads!" as the Super Star Destroyer goes down. Seriously, it's there


14. This planet in Rogue One is an anagram for "Obi Wan"

undefined

via crankystump


15. In Rogue One, we see the demise of a pilot designated Red Five

undefined

undefined

undefined

As it so happens, Luke's callsign in A New Hope is also Red Five -- looks like he picked up a fresh job opening

undefined

via kenberto