This is the second appearance of Torvald, he first appears in "Tutoring Torvald."
We learn Gerald's last name in "Gerald Moves Out." It's Johanssen.
In "Mud Bowl," Torvald trips and hurts his leg. His foot is in water with his boot next to it. Later, either his foot turned black, or he's wearing his boot in the water, because he laughs and his leg is black.
In "Gerald Moves Out," on Mrs. Johanssen's phone, the line with the *,#, and 0, it's in the wrong order. it is *#0, but it should be *0#.