Daffy Duck had previously invaded the entertainment world in 1938's "Daffy Duck in Hollywood", but in "Hollywood Daffy" they rework it. Whereas in the previous one, he raised Cain on a movie set, here he just tries to enter Warmer Bros. studios, much to the chagrin of a guard (so it's got an element of "You Ought to Be In Pictures"). But believe you me, in both cartoons he's as wacky as can be! He really goes all out in humiliating the guard and seeing references to movie stars of the era.
This, like many of Daffy's cartoons of the 1940s, bring up the issue of whether Daffy was better being completely wacky or better with the base qualities that Chuck Jones assigned to him in the 1950s. I don't really know one way or the other. In these cartoons, there's truly never a dull moment, and it always seems as if Daffy's doing his own stuff without any effort. The idea in cartoons such as "The Scarlet Pumpernickel", "Drip-Along Daffy", "Duck Dodgers in the 24 1/2 Century", "Deduce You Say" and "Robin Hood Daffy" is that these are the wrong kinds of roles for Daffy, and so he naturally makes a fool of himself (and "Duck Amuck" portrays him having trouble with reality in general). And of course the hunting season trilogy shows him trying to undermine Bugs Bunny's integrity, with poetic justice prevailing.
But no matter how you look at it, this is a really funny one. The Termite Terrace crowd always had good ideas.