Here’s my old list of ideas for a gag reel when TLJ came out…

“I see your eye. I know your eye.” (Use Maz from TFA ads to speak as Phasma’s armor cracks and we see her eye.)

“Who’s that Pokemon?” Phasma says, “Execute.” “It’s [something that looks like Eggsecute]!” Phasma rages

“It’s time for The Last Jedi… to end.” cue credits

As Yoda lifts the thing to save Obi-Wan and Anakin in AOTC, hear Rose’s line about saving what we love.

As Holdo prepares to lightspeed, Obi-Wan and Han say “turn the ship around” and “yeah I think you’re right”

Monster man in final scene is a Disney guy shutting down the kids’ unlisenced star wars merch.

Chanting of “Grond, grond…” as the battering ram thing is mounted.

Luke saying “it’s so much bigger” as Starkiller base hologram is shown at briefing in TFA.

Overlay “Save the rebellion… save the dream” over something or other in TLJ.

Have broom boy transform into the ‘Star Wars kid’ from 2003-ish. (Google it, kids.)

Luke saying Sheev instead of Palpatine.

Forrest Gump telling stormtrooper at the start of TFA "you got shot.” (Not TLJ-related.)