It's 11:25 pm, so I'm just a little fuzzy on all the production changes. Louver vents like Living in the Past mentioned definitely stands out as one. You lose the courtesy light hole and TP eyelet holes that came with a lot of the 71s.
IIRC, the biggie was moving the fuse block from the firewall to the A pillar. Could be a hassle dealing with rehanging the harness.