Probably the latter. 
I write manuals for a living and whoever wrote this one should be shot. I can't figure this out. Even accounting for translation, the parts diagram still sucks.
The diagram is showing an unnumbered, unlabeled part that connects the spray bar to the outlet elbow, and a similar piece connecting the intake pipe to the strainer. I have nothing in my bag of parts that does this. All the parts that I do have are already accounted for on the diagram.
Am I missing something? Or is it a known thing that you need to go out and buy extra stuff?

I write manuals for a living and whoever wrote this one should be shot. I can't figure this out. Even accounting for translation, the parts diagram still sucks.
The diagram is showing an unnumbered, unlabeled part that connects the spray bar to the outlet elbow, and a similar piece connecting the intake pipe to the strainer. I have nothing in my bag of parts that does this. All the parts that I do have are already accounted for on the diagram.
Am I missing something? Or is it a known thing that you need to go out and buy extra stuff?