Something about that last panel looks a bit off to me. Pogo's a bit stretched out and kind of has a goofy expression. And Albert is a bit stretched as well. As much as Kelly didn't want assistants drawing the characters, he admitted that sometimes they did. I ain't sayin', I'm just sayin'.
One time Kelly got a letter from a fan, asking who the heck inked a certain strip. Kelly was pretty perturbed, thinking his assistant had screwed it up. When they went to look it up, however, they saw it was Kelly's after all. Sometimes you're just off.