In the first film, Harry loses a chocolate frog when it jumps out of the train window. In the epilogue of the final film, a chocolate frog can be seen climbing up the window of the train carriage which has Harry, Ron and Hermione’s children in it.

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Facts about Harry Potter that you didn't know
RandomIn this book you'll finds some facts about Harry Potter characters that you probably didn't know. Enjoy! Disclaimer: I own nothing
Chocolate Frogs
In the first film, Harry loses a chocolate frog when it jumps out of the train window. In the epilogue of the final film, a chocolate frog can be seen climbing up the window of the train carriage which has Harry, Ron and Hermione’s children in it.