Found two bugs. First, Serena's cowgirl scene has missing frames. Second, the Dawn/Serena duo scene throws an exception:

I'm sorry, but an uncaught exception occurred.

While running game code:

ScriptError: could not find label 'dawn_dawn_blow'.

-- Full Traceback ------------------------------------------------------------

Full traceback:

  File "scripts/sub/train/tDawn.rpyc", line 754, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/train/tNezuko.rpyc", line 635, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/train/tSerena.rpyc", line 691, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/night.rpyc", line 22, in script call
  File "scripts/sub/train/tDawn.rpyc", line 1023, in script
  File "renpy/ast.py", line 1752, in execute
    rv = renpy.game.script.lookup(target)
  File "renpy/script.py", line 918, in lookup
    raise ScriptError("could not find label '%s'." % str(original))
ScriptError: could not find label 'dawn_dawn_blow'.

Windows-10-10.0.22000
Ren'Py 7.4.8.1895
Jump Harem 0.10