Headscratchers / Porky Pig

• In the short "Fish Tales" Porky falls asleep while fishing, and has a nightmare about himself getting caught by a giant fish, who cuts Porky's shirt off and then sticks him in an oven and tries to cook him. Then Porky wakes up from his dream and finds himself still in his fishing boat. However, Porky's shirt is still missing! If that was just a dream where Porky lost his shirt, them why is his shirt still gone when he wakes up?