Just spent an hour turning Gaspar inside out and of course I end up one brain short. Thank you for reminding me why I hate collectathons.
Spoilers
You get a Map-O-matic later on that tells you exactly where each collectible is on each planet
Skidd McMarx's agent does the carlton if you hit him with the groovitron lol
There's also new dialogue if you first meet the ryno guy while already having the ryno