Ah yes, the first short directed by the great Del Lord. Imo, it was under Del's charge that the stooges really began to shape their characters & become the greatest comedy team of all-time. Plus, the shorts he directed during this period were just plain hilarious; Pardon My Scotch, Hoi Polloi, Three Little Beers, but I'm sure we'll get to those shorts at a later date.
Getting back to "Pop", this is definitely a step up from "Restless", you got the stooges panhandling on the streets (Mister, I haven't tasted food for three days), a cameo from Moe & Larry's daughters, Phyliss Crane as a very cute art model w/ great legs (yowsers!), and the first glimpse of a wild stooge pie fight.
Ok, so it's clay, but that's only a piddling technicality. Unless, I missed something, this short also features the first "stooges in drag" moments as well. A definite winner & I almost forgot to mention the artist the stooges run into & whose painting they ruin. :-)
8.5 out of 10 for me.