To get a Blimp to appear you must get the last 2 digits matching e.g. 10.33s or 8.77s
When doing the long jump, if you are lucky enough to get all three of the distances matching e.g. 7.77m or 8.88m. A mole will pop up from the sand.
When doing the Javelin throw, run real fast but throw at an awful angle (~70°). If you got it right you'll hit a spacecraft.