The End of Flutter Valley (2) - S1-E2
Other mistake: As the Stonebacks begin to destroy the bridge the Ponies call out for help. As the bridge moves up and down, locks of Gusty and Baby Cuddles' hair flash white. Baby Cuddles is also drawn in a deformed fashion with no neck and two rumps.
The End of Flutter Valley (2) - S1-E2
Continuity mistake: When we first see the Furbobs arguing on the bridge they are coloured orange and pink. When the Bushwoolies run up to them, the orange Furbob is now blue. In a similar problem, Wishful (the purple Bushwoolie) is a tan colour when the camera shows an aerial view and the Ponies approach, but changes back to purple when the Furbobs begin to talk.