Episode 12 isn't the only episode to have The Wiggles on the Floor skit. Episode 51 also has this skit, but slightly extended. When The Wiggles slide away from each other in slow motion, a slide whistle sound effect is heard.

I remember seeing episode 51 on Sprout.

I also remember seeing episodes 23, 31, 38, 40, 41, 44 and 46 on Sprout as well.