Continuity mistake: Screwy Squirrel puts some glue on the floor and Lenny treads on the glue, ripping off his paws in the process. At this point, you can see Lenny is in bare feet, but when he is walking a few seconds later, his paws are back on his feet again.
Continuity mistake: When Screwy Squirrel is breaking the walnuts by putting on his head and hitting them with a hammer, he puts down the hammer to eat the walnuts, but when the pet shop owner takes Screwy out of his cage, the hammer has disappeared.
Continuity mistake: When Lenny jumps into the bath in the bathroom, you can see the soap dish is on the left hand side of the towel, but in the next shot it is now on the right hand side.
Trivia: "Lonesome Lenny" was the final Screwy Squirrel cartoon made by MGM.
