"Knock Knock" is the first cartoon with Woody Woodpecker, though it was considered an Andy Panda movie by Universal Studios. However, Andy really has little to do in the film...it's mostly Andy's dad fighting with this annoying Woodpecker!
The story is very simple. The Panda household is being annoyed by incessant pecking on their house by the woodpecker (his name is never given in the film). So, Papa Panda tries to stop the woodpecker...with expected results.
The quality of this cartoon is nearly as good as a film by Looney Tunes or MGM. This quality of animation and story were not the norm for Universal....usually they were more limp. Worth seeing...especially for its historical value.