When Columbo cannot sleep in the barracks and has to make a telephone call, he gets out of bed barefoot. As he starts to walk, we hear the sound of shoes on the floor. He wears laced shoes, so he couldn't have simply slipped into them as he rose.
As Columbo joins Rumsford for dinner, he is given a plate with a good-sized steak, accompanied by sweetcorn, carrots and something green, all in small neat piles. A few shots later, when the assistant cadets are excused from the table, his plate is there with the steak, but absolutely piled high with peas and green beans, but no sweetcorn at all. Then when he adds bread to his plate, it has the same ingredients as the first plate.
When Haynes walks into the Commandant's office, in the long shot, there is a solid red furled flag with white stars (it is unclear of whether or not it is a General Officer's flag which would also be in error) over the Commandant's left shoulder but in all other shots, this flag has been replaced with the California State Flag.