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P1780- Short in Park/Neutral switch circuit or bad switch. The computer is detecting the switch is ON during driving or is giving an indication of being in two gears at once.

The 0420 code is stating the converter is not functioning as it should based on the signals from the 02 (or A/F sensors) before and after the cat. The cat could be bad, one of the sensors (02, A/F), exhaust system problem.

The service manual at the link below provides a great amount of detail on these codes. Download the Gen_4, Diagnostics Section. The Toyota dealer should be able to run down the problems using their hand held diagnostics tester.

http://oregonstate.edu/~tongt/camry
 
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