In the black and white days before Bugs Bunny, Daffy Duck, and the rest of the gang, Leon Schlesinger Studios divided its time between its Looney Tunes and Merrie Melodies series. The former would feature the stars - first Bosko, next Buddy, then Porky Pig and everyone who followed him - while the latter would feature miscellaneous characters (MM started filming in color in 1934). Specifically, the cartoons in the latter series would bear the names of songs owned by Warner Bros. - such as "Lady, Play Your Mandolin!", "I Love to Singa" and "Now That Summer Is Gone" - and the characters would sing the song.
Well, "How Do I Know It's Sunday" was one of the lamest attempts. We know that it's Sunday because we see people going to church. Inside a general store, the products all come to life and happily sing the title song. An Eskimo falls for a cookie and has to come to the rescue when a swarm of flies invades. Along the way, some of the characters did things that in reality would have probably burnt the store down. It seems that for their first few years, Leon Schlesinger Studios felt as though they had to be like Disney, and so they attempted the same excessively cute stuff.
All in all, we can forgive Friz Freleng for this one. After all, he was just getting started. His real vindication came the next year with "I Haven't Got a Hat", in which he debuted Porky. Within a few years after that, the Warner Bros. animation department had totally eschewed the Disney approach to animation, and went on to create some of the greatest cartoons in history.
All in all, this one is at most worth watching as a historical reference.
