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Butterfly
When he steps on the butterfly and kills it -
Time machine
Finally finds time machine but still has no clue the present changed -
Bump
They hit a bump on there way back to the present, but nobody understands why they would come back -
Doesnt think
Get home but dont think anything happened because nothing is noticeable besides a sign they dont think anything else would changeif just a sign changed. -
Election
When Deutscher becomes president and keith doesnt. -
going back
Seeing the deutscher won and keith didnt they realize they messed something up and have to go back and see if they can prevent it from happening