This may or may not have been a slipup guys. Keep in mind, they were just in a runaway escape pod which crashlanded on Tatooine with a very large THUD. They're both shaken up and have several loose parts. In fact, C-3PO nearly got them both killed when he kicked R2-D2 in his frustration--when he did a washer fell off of R2's dome. It's the same one the stormtroopers found later.
Disconnect one spark plug from your car and the engine will still run (not as well but it WILL still work.) If you want a cheap scene look at the escape from the Death Star scene. C-3PO is in a tangled mess of wires, some of them sparking. If you look REAL CLOSE you realize that the sparking wires are simply SPARKLERS!
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