**Spoiler alert!!**
Here are all the secrets I found. You can suggest some by replying to this comment.
I found a secret you didn't mention, it is also in the Junkyard, but it's above the location of the binary umbrella. (I recorded a video and then screenshot-ed this part) [Edited/Second Image below the first...]Edit: another to be sure...?
Edit: another to be sure...?