Kitten Kong - S2-E7
Other mistake: When Twinkle (the kitten) is up the tree, Tim starts to throw up sticks, and, as a result, a big log falls on him. The 'log' is plastic, and is a completely different colour from the rest of the tree.
The Goodies (1970)
1 other mistake in season 2 - chronological order
Starring: Tim Brooke-Taylor, Bill Oddie, Graeme Garden
Genres: Comedy
The Goodies and the Beanstalk - S4-E4
Visible crew/equipment: When the bath goes off the cliffs, you can see the string lifting it, so it is obviously on a crane.
Earthanasia AKA The End of the World Show - S7-E6
Bill: Christmases come, Christmases go. They're all the ruddy same - no one ever remembers them.
Kitten Kong - S2-E7
Trivia: 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.