Actually, Kili doesn't have to get shot by the arrow. Those barrels are moving pretty violently. It's safe to assume he might have just been injured from knocking about. As long as you cut all the stuff mentioning a 'Morgul shaft', which was just an unnecessary and clumsy parallel with Frodo in Fellowship (has Jackson become George Lucas?!), then you can still have him recuperating in Lake town but without the stupidly long 'barrel battle'.

Likewise, there's then no need for Tauriel to follow as it's not a life threatening injury that requires Elvish magic to heal, so we can put a stop to this interspecies romance before it goes any further. Then there's no need for the Orc attack on Laketown or seeing any more of fucking LEGOLAS, which I find the most objectionable fan service in this whole mess.