Why did they cut out so much?
Having looked up the original script and novelization, I realized that there's a lot more material that didn't make it to the final film!
For example, after finding Grandfather with the woman he's "engaged" to, there was supposed to be a fight that broke out in that room, which ended with Ringo ending up with the woman's purse in his hands-- this would explain why they blame him in the next scene (Paul: "Anyway, it's your fault." Ringo: "Why me? George: "Why not you?").
Another thing I noticed was how the pacing seemed very off: In the movie, Norm and Shake leave the dining room, and two of the Beatles sit at table in the background; next shot shows Pattie & Prudence walking in, and the Beatles are all together again when they eye them. After Grandfather scares them off, we only see Paul facepalm. Then we cut back to Norm and Shake wondering what's taking Grandfather so long -- didn't they just leave the dining cart a few seconds ago? How does that equate to being "gone a long time"? Then when they ask the band about his whereabouts, I realized, weren't they literally just with him in the dining cart, when he scared away those schoolgirls? Why didn't we have a shot of Grandfather sneaking away while the Beatles had coffee or something?
Overall, while I still love this movie dearly - it's one of my all-time favorites! - I have to wonder why they left so much out of the script, too.