In the first scene when the hurricane has passed and Pazu and Sheeta land on the cloud, Pazu twirls Sheeta around until they are almost off the edge of the cloud (his toe actually is on the edge of the cloud). But in the next few seconds the direction changes and they end up back on the cloud.
After the robot gives Sheeta a flower for the grave, four fox squirrels are seen playing around on his shoulder. They are cameos from Miyazaki's first animated masterpiece, "Nausicaä of the Valley of the Wind." (1984).