Hey, I died twice

Petra, the dog from BBC's Blue Peter whose death was mourned by million in the 70s and honoured by a bronze bust effectively died twice. The animal was introduced to viewers as a puppy in the mid-sixties. But that baby dog died of complications the day before the next programme was due to go out, and so the then producer of the show had to rush around all the pet shops in north London with a photo looking for a duplicate pup. Luckily he found one and none of children watching knew any the wiser.