How do I know I've hit a save point in Ratchet & Clank: All 4 One?

I recently loaded up my single player game to discover I had to re-do a large section of a level; apparently I didn't progress completely through a section though I thought I had. I thought once I found the scannerbot (where you are given a summary of bolts/enemies/pets/etc.) that was a "save point", but that wasn't the case as I was getting out of the training area for the Vac-U 4000.

What should I look for to indicate I've completed a section of the game, and would be a good place to pick it up again later?

From what I can tell, the game saves every time a Scanning Minion (and thus the totals screen) shows up.