Other mistake: The calendar on the wall in Porky's kitchen shows April as having 31 days instead of 30.
Daffy Duck Hunt (1949)
1 other mistake - chronological order
Continuity mistake: When the dog is saying his prayers by the fridge in the kitchen, you can see the fridge door is shut, but when Porky threatens the dog in the next shot, the fridge door is open.
Daffy Duck: Why the copious flow of lachrymal fluid, my garrulous canine?