I struggled too. After watching the video
here, I could see how certain words in some of the clues have had a W ("for wumbo") replaced with an M ("for mini"), which need to be swapped back. Namely:
14A,
1D,
5D,
28D.
The fact that the central revealed doesn't specify how many or which clues, and that the impacted entries are placed throughout, certainly makes it harder.