How is it possible I've never seen this?!
I think I see Pip's name on teh boxcar wall!
The co-director of this WB cartoon, Joseph B. Hardaway, was the "Bugs" for whom Bugs Bunny was named. (Hardaway directed the first two proto-Bugs cartoons.) Hardaway also was the top sarge in Harry Truman's artillery outfit, and remained close well into HST's presidency.
You probably missed it because you went out and got some fresh air and exercise when your folks told ya to.