Very creative concept! Switching cars with different stats GTA-style in the middle of a sidescrolling chase is an interesting application of "self-destruction".
In addition to the keyboard bug verysoftwares mentioned, one time I hit a bug where the helicopter's attack sound effect never stopped and every vehicle I saw instantly exploded even though there wasn't an attack visible. Also, I once got both a game-over screen and a win screen together, maybe because I was doing just the right amount of damage to the helicopter at the same moment it reached the bridge.