When the Goodies are at the park with their animals, Graeme tries to teach his tortoise tricks. When the tortoise jumps, you can see the wire making it 'jump'.
When Tim is being dragged along by the cat a bit of a brown something appears. He said in an interview that this was a long stop motion sequence. During filming a small dog ran through the shot and relieved itself right in his way. Because being stop motion it would have taken too long to re-shoot the scene, Tim volunteered to be dragged into and smeared over the mess, for the sketch.