M Ted, Yes we notice those things too. I guess musicians tend to. Concertinas that are piano accordians, wrong type of guitar, wrong type of banjo - that's a common one.

It was years ago that we first noticed the wrong key thing, but like you we thought we'd remember. I'd start a new list every time we noticed and then we'd file it somewhere and lose it.
It's the old musicals where it happens. There are a few movies where someone fronts up to a piano and says "Play it in...". It does seem deliberate somehow. There seems to be no need to even mention the key - but they do. I think it's a well hidden joke.

Thanks, Barbara. That sorts out that one. Cheers, Joy