Parenthesis = possible symbolism.

Mr. burns(enemy figure)stuffs money(money/goods) down a tractors (america)exhaust causing it to blow up.(economic failure). Afterwards he comes falling down to the ground after the "explosion".(He survived the explosion) Then he continues smithers says something to the extent of "you saved us". He says something to the extent of "So, i'm the good guy? That's a surprise". (America being evil and enemys being the opposite..blahblahb)...

Or maybe i'm just thinking too far into things out of boredom :)