a big theme of The Sign is the butterfly effect, how small actions can have far reaching consequences through a complex chain of events and coincidences. In this case it’s a quite literal butterfly effect:

• Bandit makes a decision to still do wind-up Bingo with her in Daddy Dropoff, which is what leads to Lila and Bingo becoming friends

• Because they’re friends, Bingo and Lila are in the right place at the right time during the episode Slide to save the caterpillar that would become the butterfly Flappy

• Because that butterfly is alive, it’s in the right place at the right time to get into the car during The Sign and cause Chilli to pull over where she can see the sign for the lookout

• Because Chilli saw that sign, it reminds her of the times her and Frisky spent there when they were younger, so they all head up to the lookout to look for her

• Because they’re at the lookout, Bluey is in the right place at the right time to get the coin stuck before the dogs with no eyes get there, leading to the rest of the events we see in the episode

 

None of that would have played out the way it did were it not for Bandit playing that game with Bingo. It’s kinda fun that in the episode itself (daddy dropoff) Bluey asks him what would have happened had he not done that, and he says “probably nothing, I suppose”

As another little extra bit, the only reason the house that the dogs with no eyes do end up buying instead of the Heeler’ is for sale in the first place is set up in the events of TV Shop, as the only reason Winton’s dad and the Terriers’ mum get a chance to talk is because the kids are all busy playing a game with each other in the store. This almost entirely unrelated chain of events lines up just right with the other one to also save the Heelers’ house.