Gold Medal is the 5th cutscene in Run 3, 4th if you are not counting the Batteries cutscene. This is the first cutscene that the Child interferes with other characters, instead of hiding in the background.
However, when the Skater inspects the medal closer, he realizes that it is not made of gold, but bronze (or maybe copper). The Child responds, "Yeah, well, it was the closest I could find." The Skater accepts the medal anyways, saying, "It's the thought that counts."
Even though the cutscene takes place on Winter Games, part 20, both Skater and Child are on Winter Games, part 19 in the Galaxy Map. It is possible that they are heading backwards after this event in the cutscene.
It is actually quite easy to differentiate bronze and copper. Copper is durable and flexible, and can be easily bent. However, even though bronze looks quite similar, it is harder than copper and cannot be flexed as easily as copper can.