Here’s a perspective sequence from Tex Avery’s “What Price Fleadom” (1948). A bulldog is chasing a flea. Then the dog starts hopping exactly the same way as the flea, which is pretty funny. Next, Avery gives a little perspective bonus in an old gag to theatre audiences. The flea hops into a picture on the wall.
The bulldog chases after him, initially filling the screen. I’ll bet this surprised the theatre audience.
Avery’s unit was in transition around this time. Walter Clinton, Robert Bentley and Gil Turner received the animation credits.