Though comical and cheap as it may seem, Neighbours is a dark reflection about the greed of man and the irrationality of using bloodshed to solve problems. A personal reflection of the Korean War and the Vietnam War that was soon to come. It's one of those films that shows the world entirely, involving two neighbors who resort to violence, fighting each other to the death over the ownership of this one tiny flower.
War is Certain without Peace, Peace is Certain without War, love your neighbours in any language, and this is some neat trippy animated shit. It's a basic slapstick comedy with predictable results but mad inventiveness and a few real surprises. Good for a laugh and pretty much there for the whole family (though once again, the action subverts the theme of peacefulness considering how entertaining the violence is).
This aired on a seemingly endless loop throughout my childhood on Canadian TV and I'm greatful for it. I've surely seen this film as much as any of my personal favourites (yes, likely due to its length) and do feel that my exposure to it and other Norman McLaren / NFB works helped shape the film nut I grew to be. Neighbours is outstanding then and now. Watch it.