Not a spelling error, but nonetheless a huge mistake on the first 1990 2-fer issues was the mix up of page 4 and 21 in the booklets of the Friends-20/20 and Party-Stack-O-Tracks 2 fers. Which meant you started reading about the Party album in the Friends-20/20 booklet and vice versa. Page 21 wasn't too much of a problem as it showed general info on all then-current BB releases, but the layout colours obviously don't belong there.
Btw, I'm talking about the UK pressings.
Now that's a mistake.