This is because Twirlywoos is often shot against a green screen. When the green is removed in post production, the green props would disappear too! If a green prop is necessary, a blue screen is used.

The Twirlywoos watch a man practising his tennis strokes using a machine to shoot the balls to him. Once all the balls have been fired by the machine, the man collects up the balls and refills the ...

The Twirlywoos are at a theatre, watching as the actors play their parts. The scene changes and new props are moved on to the stage. The Twirlywoos help by moving some extra props on to the stage, but ...