Hmmmm...I'm thinking there are others in this forum that might have a wiser comment regarding the "repetition"...but I do know I practice the heck out of new "tricks" and commands....and I use a ton of repetition...as long as the practice is getting us somewhere. When I get to an impasse of sorts...I usually give my process some scrutiny and look for a new angle to train the dog.
Smokey looks like he is having fun figuring out the "game"....good job.
HOWEVER !!!!!! I will say...at 37 seconds into the video...your dog Smokey completely responds to your command of "book"..Smokey clearly says back to you " BOOK".......