The rear drum got a Tandems East quick disconnect cable anchor, and an Allen head bolt in place of the original Phillips head for the brake torque arm to make rear wheel removal easier. You can also see the big Phillips head screw for the rack where somebody hogged out the eyelets from M5 to M6, except for the left fender stay.
Next items on the list are to replace the bar tape with Grab-On foam grips, get a WTB saddle for the captain and maybe some Microshift 7 speed triggers to replace the Shimano twist grip shifters. Not shown in are the circa 1978 Cannondale panniers that haul our stuff, and the Detours handlebar bag on the stoker's bars for odds and ends.