Perhaps not new info for some but the manual got a HUGE improvement.
I looked through it fast, and the only direct error I see is that the MOVW instruction is marked as be in all AVR's except those with only 16 registers.
But no AVR's before 2000 (perhaps late 1999) had the instruction.
I think that it's developed together with the MUL instruction, but all later designs of tiny's also would have the instruction.
One of the GCC experts can probably find a list of all "old" chips avr0 or whatever the type without MOVW is called.