(56:15 on DVD) Hoyt hears Susan take off on her horse because she's upset, then he sees her galloping away. He runs to get a horse to follow...and conveniently comes out of the stable immediately with a horse already saddled? If he'd had to saddle a horse, as should have happened, he never would have caught her, but no one leaves a horse saddled all the time for such "convenience".
Near the end of the film, after Troy Donahue's character has left the hospital waiting room, there is a close-up of Connie Stevens with Donahue's shoulder still visible just behind her.
When Susan goes for a walk on deck after the ship leaves port in Chile, the port is too close and is not even moving in relation to the ship - as seen on the right side of the frame.
During the party scene, when Susan jumps onto her bed to grab the phone, the reflection of a cameraman and a camera can clearly be seen in the glass of a framed picture above her.
At the Old Southern Pacific train station in Monterey, when Susan's train arrives from San Francisco, the train is going the wrong way (we see the northbound train to San Francisco, not the southbound train from San Francisco).
When the passenger liner is depicted as leaving Valparaíso, Chile, in the background is the skyline of San Francisco - the home port of the S.S. President Cleveland, the ship used in this film.
When Susan goes for a walk aboard the ship, Leah goes to sit on the bed next to Roger, and a shadow of the boom microphone moves into the frame, upper left on the wall.