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Even though it's not entirely working yet, at least we have some decoration just in time for Christmas! Some of the lamps don't light while others light all the time. Time for more troubleshooting again...
Some of these problems come in groups: the first 16 lamps on output # 6 don't light up, the first 16 lamps on output # 7 light up all the time, and the first 24 lamps on output # 8 don't light up. These are the last 2, 2 and 3 chips on those outputs, so I'm sure I messed up output board number 2 in a somewhat consistent manner (it almost has to be the connection from one shift register to the next). 172 out of 235 lamps are working perfectly.
Not all switches are completely working either. Five pairs are ganged together (shorted somewhere), and one plainly doesn't work at all.