7DFA1: Initial palette set for each level
6F010: Palette set - Offset Low
6F110: Palette set - Offset High
6E010 ($37): Palette set Bank 1
50010 ($28): Palette set Bank 2 ($6A0 => 0)

Palette set format:
do
 +[start of destination]
 +[byte]
  if byte >=$40 then output $F, then (byte And $3F)
   if byte >=$80 then last byte of palette set
  else
   output byte
 loop

Palette set routine used for mid-level palette
updates as well.

740CF: Level Sprite Offset? - Low?
740DF: Level Sprite Offset? - High?

74/75 (RAM): Sprite Offset (RAM)