Dune

the natural ending point should have been the Harkonnen attack on Arrakis and Paul and Jessica's flight/escape into the desert. Shave off the last 30-40 mins where they meet the Fremen, and use that freed-up time/screen space to expand the section after they've first arrived on the planet. Retain the sub-plot about Jessica being under suspicion of being a Harkonnen spy, give us more time with Leto, Thurfir Hawat, the Guild ambassadors etc., possibly mirrored with a few more scheming scenes with the Baron, Piter, and Feyd-Rautha etc. I feel that would have allowed for much more time with the characters/character development, as well as expanding on the political intrigue elements of the story, and would have lent itself to a fairly standard three act structure: (i) before they arrive, (ii) on Arrakis and the perceived threat of a Harkonnen attack/distrust of the Jessica and the Bene Gesserit, (iii) culminating with the attack and escape into the desert. End.