The cake that Violet and Jefferson take to the party changes size from the time it leaves the kitchen to its arrival in the dining area. It leaves the kitchen very tall and arrives considerably shorter.
Maggie's hair changes length from one shot to another, sometimes reaching her shoulders, sometimes tightly framing her face.
Maggie and Violet are in the kitchen when a horn honks that sounds like it's right outside the door. When Violet goes to look, though, the car is just pulling into the property, quite a ways from the porch. The horn couldn't have been that loud from that distance.
(at around 49 mins) Maggie's left hand goes from her face to the couch.
(at around 40 mins) Maggie's hand on Pete's shoulder changes.
Having been found in the Brazilian jungle, Peter returns to Maryland and Maggie. He returns by plane, and lands in the same field he did earlier. BUT he does so in the dark an hour before midnight, in a field with trees and with NO lights, and lives to tell about it! A miraculous feat of which any pilot would be envious.
When Pete lands home after being lost in Brazil and disembarks from the plane, he calls out for Margie. Pete's male companion tells him, "Take it easy, Pete". However, after saying the aforementioned words, his lips continue moving, but nothing is heard. Apparently the dialog was looped, but some words were left out.
At around 53:15, when Maggie walks around Sandra's bed, a studio light is visible in the lower right corner.
When Maggie returns to Maryland from New York, she steps out of her car if front of her house. Overhead, above her car, Spanish Moss hangs from the trees. BUT Spanish Moss does NOT grow in Maryland.
When Maggie drives up the dirt road in a black car to meet Pete's plane, the reflection of the boom mic can be seen on the windshield of the car, just as Maggie says "That's Pete; that's his signal."