Got a few things. If you change this quick enough you can get my bubble before I have to leave.
Hard:
02:21:69 (5,6) - Further from the stack of 3
Normal:
00:28:51 (5,6,7,8,1,2,3) - Distinguish between half notes and full notes better here. Specifically the 5,6,7,8 and the blue 3
00:59:65 (1) - Further
01:12:66 (1) - Further
01:29:65 (4,5) - The 4 could be mistaken for a full beat, a bit closer to the 3.
Normal map as a whole has some misleading spots where halves could be mistaken as fulls. These were just the major problem areas I found. This could possibly be due to your grid level. If you aren't already, use a level 4 (3?) grid. The max.
I'm not going to point out all of them but for your next map perhaps you could get a bit more strict when it comes to spacing.