At one of the cuts between shots when Greta is helping pack Larry's suitcase for his trip to Montreal, the suitcase changes from open to closed and Greta's position changes from hands resting on the suitcase to arms crossed. This "goof" was corrected when the 15 minutes of deleted footage from the film was reinstated in 2021.
Although Greta presumably rode her horse to the falls, when Larry finds it standing at the edge of the cliff, it is not wearing a saddle or bridle. Then later, when the cop spots the horse lying down by the water, it is wearing a bridle.
When the police and Larry find the horse and Greta's body, Larry had been out of the country for many weeks. Unless the horse fell the long after Larry threw Greta's body into the river it would have starved to death by the time they found the body.
When Larry and Verna approach the maitre d' at the restaurant (just before Larry runs into Janice), Verna turns around as they stop. But on the cut shot, Verna is facing forward then turns around again.
Verna quotes a line of poetry as "Gather ye rosebuds while ye can." The line actually ends in "may."
Greta buys a ranch near Owens Lake. That is in Inyo county and the Owens Valley. Larry twice gives the address of the property as being in Tualre county which is in the middle of California and not near Owens.
Why would a murder that took place in Inyo or Tulare county be tried in LA county? It wouldn't.
Trenton is told Janice is in room 127. A sign in the hallway indicates 127 is to the right. Trenton goes left to her room.
When Larry and Verna are driving to Reno and the truck veers in front of them, the windshield cracks before they collide.
The desk clerk tells Trenton that Janice is in room 127, at the end of the hallway and to the right. But when he gets to the end of the hallway, the sign above him indicates that rooms 121 through 137 are down the hallway behind him. Instead of backtracking, he goes forward to the room that Janice is in.