Continuity errors? Blame it on the director.
Maybe I missed it, but I've never seen anyone blame Nimoy for the problems with ST3.
Everyone and his dog blames Shatner for ST5, but it seems that no one wants to stick Nimoy with that kind of stigma.
True! One of the most terrible cont errors I've ever seen is where they slipped in a shot of a a klingon and expected the audience wouldn't notice it WASN'T Saavik.
Oh yeah, the svelte Saavik in a Starfleet uniform looks exactly like a burly klingon in leather warriors outfit.