Im wondering about the Replay "shotputfinal". How do you make your head spin like that? I dont have the full game, so if thats a thing only in the full version tell me.

Here you go: .rpl file editing.
That might help. And I'm not sure, but I don't think you can do it in the demo version, sorry.

We don't (and can't) prevent unregistered players from editing their replay files ;-)