“We’ve almost got some of their telecommunications cracked; the front end even runs on a laptop!” The Mac that sunk a thousand ships could have been merely clunky product placement, not a bafflingly stupid tech-on-film moment.
“Senator Amidala is in a coma. Even if she recovers, she will never be the same and may not live long.” But no… George had to have his god-damned funeral scene, even if it demanded Simone Biles levels of mental gymnastics to save Carrie Fisher’s most emotionally resonant moment from ROTJ, as well as one of the more intriguing OT lore dumps.
Bonus points if a scene was scripted or filmed and got cut.
Probably one of the most famous examples, but the robots in The Matrix originally kept humans around as wetware CPUs using their spare brainpower. Studio execs forced the Wachowskis to change it to them using humans as batteries, even though that makes no sense. Agent Smith possessing someone in the real world in the sequels would have made a ton more sense with the original explanation.