Blast from the Past/Chew Said a Mouthful/See What Develops - S1-E8
Continuity mistake: Blast From the Past: When Sniffles oils the seesaw and Lumpy, Cuddles, Giggles, and Toothy come to the playground, Giggles runs to the swing set, which has swings. When Lumpy jumps onto the seesaw and Cuddles flies into the air, the swings are missing from the swing set. Giggles isn't there either. This same scene plays again after Sniffles travels through time, so the mistake happens twice. (00:03:50)