This video demonstrate the training course glitch in Paperboy Arcade (Rev 1 and Rev 2).
In the training course at the end of a day, there is a 1 pixel gap between the hit-box of the finish line and the hit-box of the fence on the right of the finish line. If you ride between those two hit-box, the game will let you past the end.
Then you ride in what seem like the training course but you ride in garbage and the more you go the more you corrupt the memory.
The third time you see the finish line, the hit-box will work, you can end there or redo the trick but you corrupt more and more the memory and eventually the game will reset.
If you're lucky, you may end up with a huge score, but since memory is corrupted, it's not guaranteed to work every time.
This glitch is not working with the last version (Rev 3) of the game. Work only with Rev 1 and 2 (in Mame: paperboyr1 and paperboyr2)
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