Transition state and intermediate very close to each other
1 Kcal/mol is indeed quite low. This is around 1 hydrogen bond energy. In general - compute frequencies using freq command in Gaussian or whatever you are using. You should have a single negative frequency. It should be relatively low (abs value compared to lowest positive frequencies). Visualize it using Moleken or a similar tool. If movement is along the reaction coordinate then you are good.

Also, compare all bond lengths and angles to see what changed. Did bonds along the reaction coordinate change the most?

Please use Kcal/mol instead of Hartrees. I realize that Gaussian prints out 
Hartrees, but it is easy enough to convert to Kcal/mol.