When Porky first goes to bed in his bedroom, the cat sings 'Figaro'. After hitting the cat with something, Porky goes back to bed, and the cat starts singing 'When Irish Eyes Are Smiling'. Suddenly, the room Porky is in is his living room, not his bedroom. After throwing the book 'Dr. Fu Manchu' at the cat (and getting hit with 'The Return of Fu Manchu'), Porky slams the window closed, turns around to walk away, and suddenly Porky is back in his bedroom.
After 'conducting' the radio, the cat runs out the door, which has no locks visible. When Porky gets to the door, it has a keyhole lock (with key in it) and a lock chain.
When Porky first goes to bed, there is a chair next to his bed, and a clothes tree next to that. The second time he goes to bed, after being hit by the book 'The Return of Fu Manchu', there is a table with a telephone next to the bed, and a chair next to the table. The third time, when the cat puts Porky to bed, the arrangement is back to a chair and clothes tree.
After the cat dies, there are seven cat ghosts numbered 1, 2, 3, 5, 6, 7, 9 - numbers 4 and 8 are missing.