Clarification about Caylus favours
Right: you can't move my marker up to the 3rd row to collect 3 points or build a stone building, with the favors I've earned right after scoring the dungeon. See the example on the last page of the rules:

Orange has just gained a favor during the Dungeon scoring. He chooses the first line (prestige points), on which he already advanced in a previous phase. However,
since the Dungeon is being scored, Orange can’t advance his marker. He leaves it on its space and gains 2 prestige points.