When Lucy and Ethel get off the tour bus and the bus drives off without them, if you look at the right front seat you can see Lucy and Ethel are still on the bus as it pulls away.
Inside the Widmark game room, Cap (Widmark's enormous dog) watches the conversation between Ricky and Widmark on one side, and Lucy on the other, turning his head back and forth. In some shots his darker right leg is on the left of the screen, in others it's on the right. The chair in the background hallway also changes sides as the shots are reversed.
When one is going from downtown LA to Beverly Hills via Wilshire Blvd., the LaBrea Tar Pits are on the right, not on the left as the tour driver states.
1950's protocol dictated that Lucy would have dressed in a suit or dress to take a bus tour (the way Ethel and the other woman on the tour were dressed); her casual slacks outfit was merely to accommodate the script that required her to climb a wall.