As long as we’re starting from the base assumption of being stuck with the SE, we may as well make the existing SE more tonally consistent.

Star Wars

In the cantina, there should be an extended music video that pauses the story for a few minutes, breaks the fourth wall, and is generally incongruous with the rest of the cantina. You should be able to see at least one of the cantina musicians’ uvulas as they scream at the camera.
After Obi-Wan dies and his ghost voice speaks to Luke, it should be Ewan McGregor’s voice.
At the end of the awards ceremony, Jar Jar should yell “Weesa free! …At least weesa thinks so!”

Empire Strikes Back

The Wampa should blink creepily.
When the snowspeeders blow up the fallen imperial walker, there should be a praxis effect ring.
In Cloud City, Vader should yell “Maclunkey!” and shoot at Han before Han shoots at him.
Cloud City should have comic dinosaur antics in the hallways as Lando shows the crew around.

Return of the Jedi

Luke Skywalker’s hologram should carefully explain to Jabba that Han is his prisoner, to which Jabba responds: “How is this possible?” Luke’s hologram calmly responds that if Jabba checks his favorite decoration, he’ll know it to be true.
When Boba Fett falls into the Sarlacc, the Emperor should scream. The Sarlacc’s burp should also be the Ian McDiarmid’s burp.
The Sarlacc should yell “Maclunkey!” and shoot at Han before Han shoots at it.