Errata: Making Games For The NES#
Chapter 6: “The PPU has an alternate mode that displays 32 sprites, but each sprite is 16 pixels (two tiles) high.” This is not true, you have access to all 64 sprites.
Chapter 32: The MMC3 IRQ example might not work on all emulators. See this thread for details.
Chapter 37: I think the -> is pointing the wrong way, it should be like this:
lda PageData,y ; A <- PageData[Y]